$SLG
SL GREEN REALTY CORP Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000104097124000010 Filed on February 23, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$187.9M	$295.8M	$913.7M
YoY Change	-15.96%	31.56%	10.52%
Cost Of Revenue	$102.2M	$196.9M	$478.2M
YoY Change	2.44%	107.29%	40.95%
Gross Profit	$85.70M	$98.97M	$435.6M
YoY Change	-30.79%	-23.81%	-10.66%
Gross Profit Margin	45.61%	33.45%	47.67%
Selling, General & Admin	$21.30M	$42.27M	$111.4M
YoY Change	-8.58%	73.88%	18.76%
% of Gross Profit	24.85%	42.71%	25.58%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$50.12M	$51.45M	$255.6M
YoY Change	-37.79%	-31.27%	14.58%
% of Gross Profit	58.49%	51.98%	58.69%
Operating Expenses	$21.30M	$92.24M	$111.4M
YoY Change	-8.58%	-5.16%	18.76%
Operating Profit	$64.40M	$6.727M	$324.2M
YoY Change	-35.94%	-79.39%	-17.67%
Interest Expense	$48.87M	-$84.51M	$228.8M
YoY Change	-24.63%	26.15%	37.45%
% of Operating Profit	75.88%	-1256.3%	70.6%
Other Income/Expense, Net	-$52.12M	-$76.85M	-$382.4M
YoY Change		1117.28%	5956.93%
Pretax Income	$18.39M	-$160.1M	-$599.3M
YoY Change	-147.94%	149.9%	685.47%
Income Tax	$700.0K		$8.200M
% Of Pretax Income	3.81%
Net Earnings	$16.88M	-$157.0M	-$564.6M
YoY Change	-146.9%	141.69%	623.11%
Net Earnings / Revenue	8.98%	-53.08%	-61.79%
Basic Earnings Per Share	$0.20		-$9.12
Diluted Earnings Per Share	$0.20	-$2.50	-$9.12
COMMON SHARES
Basic Shares Outstanding	64.80M shares	64.42M shares	63.81M shares
Diluted Shares Outstanding	70.10M shares		67.97M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$206.7M	$231.4M	$221.8M
YoY Change	22.16%	7.88%	9.13%
Cash & Equivalents	$196.0M	$221.8M	$221.8M
Short-Term Investments	$10.67M	$9.591M
Other Short-Term Assets
YoY Change
Inventory	$21.59M
Prepaid Expenses
Receivables	$318.9M	$310.1M	$310.1M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$536.5M	$531.9M	$531.9M
YoY Change	9.8%	1.7%	1.7%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.114B	$5.021B	$5.021B
YoY Change	-28.4%	-29.87%	-29.87%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$2.985B	$2.983B	$3.340B
YoY Change	-5.69%	-6.48%	-12.68%
Other Assets	$231.8M	$225.2M	$225.2M
YoY Change	-26.64%	-25.43%	-25.43%
Total Long-Term Assets	$9.228B	$8.999B	$8.999B
YoY Change	-22.15%	-23.95%	-23.95%
TOTAL ASSETS
Total Short-Term Assets	$536.5M	$531.9M	$531.9M
Total Long-Term Assets	$9.228B	$8.999B	$8.999B
Total Assets	$9.764B	$9.531B	$9.531B
YoY Change	-20.89%	-22.86%	-22.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$101.5M	$153.2M	$153.2M
YoY Change	-32.73%	-1.1%	-1.1%
Accrued Expenses	$846.8M	$845.6M	$845.6M
YoY Change	-6.84%	-7.01%	-7.01%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.025B	$1.069B	$1.069B
YoY Change	-9.49%	-5.92%	-5.92%
LONG-TERM LIABILITIES
Long-Term Debt	$3.891B	$3.596B	$3.596B
YoY Change	-31.51%	-35.97%	-35.97%
Other Long-Term Liabilities	$605.7M	$605.5M	$605.5M
YoY Change	10.57%	19.08%	19.08%
Total Long-Term Liabilities	$4.497B	$4.202B	$4.202B
YoY Change	-27.81%	-31.4%	-31.4%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.025B	$1.069B	$1.069B
Total Long-Term Liabilities	$4.497B	$4.202B	$4.202B
Total Liabilities	$5.522B	$5.271B	$5.578B
YoY Change	-24.99%	-27.41%	-26.53%
SHAREHOLDERS EQUITY
Retained Earnings	-$229.6M	-$151.6M
YoY Change	-141.82%	-123.27%
Common Stock	$660.0K	$660.0K
YoY Change	0.61%	0.61%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.736B	$3.786B	$3.953B
YoY Change
Total Liabilities & Shareholders Equity	$9.764B	$9.531B	$9.531B
YoY Change	-20.89%	-22.86%	-22.86%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$16.88M	-$157.0M	-$564.6M
YoY Change	-146.9%	141.69%	623.11%
Depreciation, Depletion And Amortization	$50.12M	$51.45M	$255.6M
YoY Change	-37.79%	-31.27%	14.58%
Cash From Operating Activities	-$24.68M	$48.20M	$229.5M
YoY Change	-158.27%	82.17%	-16.87%
INVESTING ACTIVITIES
Capital Expenditures	$55.32M	$65.66M	$259.7M
YoY Change	-10.66%	-37.92%	-28.91%
Acquisitions
YoY Change
Other Investing Activities	$51.60M	-$34.69M	$431.0M
YoY Change	-1259.36%	-113.43%	-45.52%
Cash From Investing Activities	-$3.713M	-$100.4M	$171.3M
YoY Change	-94.41%	-165.81%	-59.76%
FINANCING ACTIVITIES
Cash Dividend Paid	$54.14M		$230.9M
YoY Change	-5.63%		-11.9%
Common Stock Issuance & Retirement, Net			$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$11.37M	78.42M	-$449.4M
YoY Change	-510.06%	-143.57%	-31.37%
NET CHANGE
Cash From Operating Activities	-$24.68M	48.20M	$229.5M
Cash From Investing Activities	-$3.713M	-100.4M	$171.3M
Cash From Financing Activities	$11.37M	78.42M	-$449.4M
Net Change In Cash	-$17.02M	26.27M	-$48.54M
YoY Change	-36.46%	-2664.94%	-203.11%
FREE CASH FLOW
Cash From Operating Activities	-$24.68M	$48.20M	$229.5M
Capital Expenditures	$55.32M	$65.66M	$259.7M
Free Cash Flow	-$79.99M	-$17.46M	-$30.16M
YoY Change	308.77%	-77.99%	-66.18%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-579509000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-9.12
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.49
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-9.12
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.49
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.50
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63809000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63917000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65740000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67929000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70769000	shares
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	usd
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	6631000	usd
CY2023	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	15066000	usd
CY2023	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2777000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.2288
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3855925000	usd
CY2022	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1864000000	usd
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1808000000	usd
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	525000	usd
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	525000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	336984000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	372795000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	384054000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001040971
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	1-13199
CY2023	dei	Entity Registrant Name EntityRegistrantName	SL GREEN REALTY CORP
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3956775
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Vanderbilt Avenue
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10017
CY2023	dei	City Area Code CityAreaCode	212
CY2023	dei	Local Phone Number LocalPhoneNumber	594-2700
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	1700000000	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	64799013	shares
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	New York, New York
CY2023Q4	us-gaap	Land Land	1092671000	usd
CY2022Q4	us-gaap	Land Land	1576927000	usd
CY2023Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	3655624000	usd
CY2022Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	4903776000	usd
CY2023Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1354569000	usd
CY2022Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1691831000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	953236000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1026265000	usd
CY2023Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7056100000	usd
CY2022Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	9198799000	usd
CY2023Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	2035311000	usd
CY2022Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	2039554000	usd
CY2023Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5020789000	usd
CY2022Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	7159245000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221823000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221823000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203273000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203273000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	113696000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	113696000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	180781000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	180781000	usd
CY2023Q4	us-gaap	Marketable Securities MarketableSecurities	9591000	usd
CY2022Q4	us-gaap	Marketable Securities MarketableSecurities	11240000	usd
CY2023Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	33270000	usd
CY2022Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	34497000	usd
CY2023Q4	us-gaap	Other Receivables OtherReceivables	12168000	usd
CY2022Q4	us-gaap	Other Receivables OtherReceivables	27352000	usd
CY2023Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	264653000	usd
CY2022Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	257887000	usd
CY2023Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	1630000	usd
CY2022Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	1811000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	13520000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	6630000	usd
CY2023Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	346745000	usd
CY2022Q4	us-gaap	Secured Debt SecuredDebt	3227563000	usd
CY2023Q4	us-gaap	Line Of Credit LineOfCredit	554752000	usd
CY2023Q4	us-gaap	Unsecured Debt UnsecuredDebt	99795000	usd
CY2023Q4	us-gaap	Senior Notes SeniorNotes	1244881000	usd
CY2022Q4	us-gaap	Senior Notes SeniorNotes	1641552000	usd
CY2022Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	623280000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2983313000	usd
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3190137000	usd
CY2023Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	111463000	usd
CY2022Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	121157000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	413670000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	546945000	usd
CY2023Q4	us-gaap	Assets Assets	9531181000	usd
CY2022Q4	us-gaap	Assets Assets	12355794000	usd
CY2023Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	17930000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	471401000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	236211000	usd
CY2023Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	153164000	usd
CY2022Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	154867000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	134053000	usd
CY2022Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	272248000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	105531000	usd
CY2022Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	104218000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	827692000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	895100000	usd
CY2023Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	20280000	usd
CY2022Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	21569000	usd
CY2023Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	49906000	usd
CY2022Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	50472000	usd
CY2023Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	usd
CY2022Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	5270704000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	7260936000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	238051000	usd
CY2022Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	269993000	usd
CY2023Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	166501000	usd
CY2022Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	177943000	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	221932000	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	221932000	usd
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65786000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65786000	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65440000	shares
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65440000	shares
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	1060000	shares
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	1060000	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	660000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	656000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3826452000	usd
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3790358000	usd
CY2023Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	128655000	usd
CY2022Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	128655000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	17477000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	49604000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-151551000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	651138000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	3786315000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	4585033000	usd
CY2023Q4	us-gaap	Nonredeemable Noncontrolling Interest NonredeemableNoncontrollingInterest	69610000	usd
CY2022Q4	us-gaap	Nonredeemable Noncontrolling Interest NonredeemableNoncontrollingInterest	61889000	usd
CY2022	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	671500000	usd
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	678176000	usd
CY2023	slg	Segment Operator Revenue SegmentOperatorRevenue	118260000	usd
CY2022	slg	Segment Operator Revenue SegmentOperatorRevenue	89048000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3855925000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4646922000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	9531181000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12355794000	usd
CY2023	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	683335000	usd
CY2021	slg	Segment Operator Revenue SegmentOperatorRevenue	16311000	usd
CY2023	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	34705000	usd
CY2022	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	81113000	usd
CY2021	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	80340000	usd
CY2023	us-gaap	Other Income OtherIncome	77410000	usd
CY2022	us-gaap	Other Income OtherIncome	77793000	usd
CY2021	us-gaap	Other Income OtherIncome	86483000	usd
CY2023	us-gaap	Revenues Revenues	913710000	usd
CY2022	us-gaap	Revenues Revenues	919454000	usd
CY2021	us-gaap	Revenues Revenues	861310000	usd
CY2023	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	143757000	usd
CY2022	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	138228000	usd
CY2021	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	152835000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	27292000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	26943000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	26554000	usd
CY2023	slg	Segment Operator Expense SegmentOperatorExpense	101211000	usd
CY2022	slg	Segment Operator Expense SegmentOperatorExpense	89207000	usd
CY2021	slg	Segment Operator Expense SegmentOperatorExpense	16219000	usd
CY2023	us-gaap	Interest Expense Other InterestExpenseOther	137114000	usd
CY2022	us-gaap	Interest Expense Other InterestExpenseOther	89473000	usd
CY2021	us-gaap	Interest Expense Other InterestExpenseOther	70891000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7837000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7817000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11424000	usd
CY2023	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	9201000	usd
CY2022	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	2647000	usd
CY2021	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	1000000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	247810000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	216167000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	216969000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	6890000	usd
CY2022	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
CY2021	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	2931000	usd
CY2023	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1099000	usd
CY2022	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	409000	usd
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	3773000	usd
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	111389000	usd
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	93798000	usd
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	94912000	usd
CY2023	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	990296000	usd
CY2022	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	838752000	usd
CY2021	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	764661000	usd
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-76509000	usd
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-57958000	usd
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-55402000	usd
CY2023	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-13368000	usd
CY2022	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-131000	usd
CY2021	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-32757000	usd
CY2023	slg	Gain Loss On Purchase Price Fair Value Adjustment Gross GainLossOnPurchasePriceFairValueAdjustmentGross	-17260000	usd
CY2022	slg	Gain Loss On Purchase Price Fair Value Adjustment Gross GainLossOnPurchasePriceFairValueAdjustmentGross	-8118000	usd
CY2021	slg	Gain Loss On Purchase Price Fair Value Adjustment Gross GainLossOnPurchasePriceFairValueAdjustmentGross	210070000	usd
CY2023	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-32370000	usd
CY2022	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-84485000	usd
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	287417000	usd
CY2023	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-382374000	usd
CY2022	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-6313000	usd
CY2021	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-23794000	usd
CY2023	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-870000	usd
CY2022	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1551000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	-599337000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	-76303000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	usd
CY2023	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-37465000	usd
CY2022	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-5794000	usd
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	25457000	usd
CY2023	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-4568000	usd
CY2022	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	1122000	usd
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-1884000	usd
CY2023	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	7255000	usd
CY2022	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	6443000	usd
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	7305000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-564559000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-78074000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	449754000	usd
CY2023	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	usd
CY2022	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	usd
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-93024000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	434804000	usd
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.57
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67972000	shares
CY2023	us-gaap	Profit Loss ProfitLoss	-599337000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	-76303000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-32437000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	103629000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	21427000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1650000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1440000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	104000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-34087000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	102189000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	21531000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-633424000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	25886000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	502163000	usd
CY2023	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-34778000	usd
CY2022	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1771000	usd
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	30878000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-1960000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	5827000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	1042000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-596686000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18288000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	470243000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935795000	usd
CY2021	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	447870000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	20489000	usd
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	738000	usd
CY2021	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-9851000	usd
CY2021	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	32583000	usd
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	337624000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	818000	usd
CY2021	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	336000	usd
CY2021	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	4476000	usd
CY2021	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	123529000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	6.2729
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	410373000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	usd
CY2022	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	-76952000	usd
CY2022	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	29817000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	96362000	usd
CY2022	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	usd
CY2022	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	525000	usd
CY2022	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	39974000	usd
CY2022	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	32034000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	151197000	usd
CY2022	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	52164000	usd
CY2022	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4699000	usd
CY2022	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	160620000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.6896
CY2022	us-gaap	Dividends Common Stock DividendsCommonStock	235395000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4646922000	usd
CY2023	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	-569127000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-32127000	usd
CY2023	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	usd
CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	525000	usd
CY2023	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-15486000	usd
CY2023	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	35573000	usd
CY2023	us-gaap	Dividends Common Stock DividendsCommonStock	207694000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	-599337000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	-76303000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	255647000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	223984000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	228393000	usd
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-76509000	usd
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-57958000	usd
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-55402000	usd
CY2023	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	9897000	usd
CY2022	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	780000	usd
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	824000	usd
CY2023	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-13368000	usd
CY2022	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-131000	usd
CY2021	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-32757000	usd
CY2023	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	-17260000	usd
CY2022	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	-8118000	usd
CY2021	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	210070000	usd
CY2023	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-382374000	usd
CY2022	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-6313000	usd
CY2021	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-23794000	usd
CY2023	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-32370000	usd
CY2022	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-84485000	usd
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	287417000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	6890000	usd
CY2022	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
CY2021	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	2931000	usd
CY2023	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-870000	usd
CY2022	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	usd
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1551000	usd
CY2023	us-gaap	Straight Line Rent StraightLineRent	17903000	usd
CY2022	us-gaap	Straight Line Rent StraightLineRent	5749000	usd
CY2021	us-gaap	Straight Line Rent StraightLineRent	6701000	usd
CY2023	slg	Non Cash Lease Expense NonCashLeaseExpense	20435000	usd
CY2022	slg	Non Cash Lease Expense NonCashLeaseExpense	22403000	usd
CY2021	slg	Non Cash Lease Expense NonCashLeaseExpense	17234000	usd
CY2023	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-28174000	usd
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	5676000	usd
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-37164000	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1725000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-14370000	usd
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	20561000	usd
CY2023	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-15788000	usd
CY2022	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-6666000	usd
CY2021	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	8727000	usd
CY2023	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	17427000	usd
CY2022	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	21792000	usd
CY2021	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	10117000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1922000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	28204000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20245000	usd
CY2023	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	11974000	usd
CY2022	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-30839000	usd
CY2021	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-66387000	usd
CY2023	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	8057000	usd
CY2022	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	18332000	usd
CY2021	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-1727000	usd
CY2023	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-11796000	usd
CY2022	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	1111000	usd
CY2021	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-33241000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	229503000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	276088000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	255979000	usd
CY2023	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	0	usd
CY2022	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	64491000	usd
CY2021	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	152791000	usd
CY2023	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	259663000	usd
CY2022	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	300770000	usd
CY2021	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	302486000	usd
CY2023	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	184481000	usd
CY2022	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	184518000	usd
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	88872000	usd
CY2023	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	140569000	usd
CY2022	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	141742000	usd
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	770604000	usd
CY2023	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	557611000	usd
CY2022	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	626364000	usd
CY2021	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	651594000	usd
CY2023	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
CY2022	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	60494000	usd
CY2021	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
CY2023	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	0	usd
CY2022	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	0	usd
CY2021	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	9475000	usd
CY2023	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	usd
CY2022	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	15626000	usd
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	4528000	usd
CY2023	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	usd
CY2022	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	usd
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10000000	usd
CY2023	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	17334000	usd
CY2022	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-1432000	usd
CY2021	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-40200000	usd
CY2023	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	65357000	usd
CY2022	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	51367000	usd
CY2021	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	95695000	usd
CY2023	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	0	usd
CY2022	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	181293000	usd
CY2021	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	167024000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	171345000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	425805000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	993581000	usd
CY2023	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	381980000	usd
CY2021	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	39689000	usd
CY2023	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	25826000	usd
CY2022	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	292364000	usd
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	375044000	usd
CY2023	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	538000000	usd
CY2022	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1524000000	usd
CY2021	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1488000000	usd
CY2023	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	828000000	usd
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1556000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	151197000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	341403000	usd
CY2023	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	11700000	usd
CY2022	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	17967000	usd
CY2021	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	6040000	usd
CY2023	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	9076000	usd
CY2022	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	40901000	usd
CY2021	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	25703000	usd
CY2023	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	2777000	usd
CY2022	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	4699000	usd
CY2021	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	6631000	usd
CY2023	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	6932000	usd
CY2022	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	52164000	usd
CY2021	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	336000	usd
CY2023	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	usd
CY2022	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	29817000	usd
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	usd
CY2023	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	14779000	usd
CY2022	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	16272000	usd
CY2021	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	15749000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	230931000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	262136000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	271075000	usd
CY2023	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	129656000	usd
CY2022	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	77874000	usd
CY2021	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	51862000	usd
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3915000	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2990000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1407000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8098000	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13745000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	434000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-449383000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-654823000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1285371000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-48535000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	47070000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-35811000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	335519000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	384054000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	336984000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	229119000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	169519000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	152773000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	7815000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	5358000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	4405000	usd
CY2023	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	0	usd
CY2022	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	0	usd
CY2021	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	27586000	usd
CY2023	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	0	usd
CY2022	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	190652000	usd
CY2021	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	0	usd
CY2023	us-gaap	Transfer Of Investments TransferOfInvestments	349946000	usd
CY2022	us-gaap	Transfer Of Investments TransferOfInvestments	193995000	usd
CY2021	us-gaap	Transfer Of Investments TransferOfInvestments	9468000	usd
CY2023	slg	Assumption Of Mortgage And Mezzanine Loans AssumptionOfMortgageAndMezzanineLoans	0	usd
CY2022	slg	Assumption Of Mortgage And Mezzanine Loans AssumptionOfMortgageAndMezzanineLoans	1712750000	usd
CY2021	slg	Assumption Of Mortgage And Mezzanine Loans AssumptionOfMortgageAndMezzanineLoans	60000000	usd
CY2023	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	0	usd
CY2022	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	160620000	usd
CY2021	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	121418000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	18518000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	7580000	usd
CY2021	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	9851000	usd
CY2023	slg	Investment In Joint Venture InvestmentInJointVenture	0	usd
CY2022	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	39974000	usd
CY2022	slg	Investment In Joint Venture InvestmentInJointVenture	47135000	usd
CY2021	slg	Investment In Joint Venture InvestmentInJointVenture	0	usd
CY2023	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	101351000	usd
CY2022	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	0	usd
CY2021	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	66837000	usd
CY2023	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	1712750000	usd
CY2022	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	0	usd
CY2021	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	510000000	usd
CY2023	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	0	usd
CY2022	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	302000	usd
CY2021	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	8372000	usd
CY2023	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	0	usd
CY2022	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	0	usd
CY2021	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	140855000	usd
CY2023	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	0	usd
CY2022	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	0	usd
CY2021	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	64120000	usd
CY2023	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	0	usd
CY2022	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	0	usd
CY2021	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	53548000	usd
CY2023	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	0	usd
CY2023	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	16313000	usd
CY2022	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	30359000	usd
CY2021	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	19831000	usd
CY2023	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	0	usd
CY2022	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	0	usd
CY2021	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	4476000	usd
CY2023	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	8134000	usd
CY2022	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	0	usd
CY2021	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	0	usd
CY2023	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	0	usd
CY2022	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	0	usd
CY2021	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	358000	usd
CY2023	slg	Share Repurchases Or Redemption Payable ShareRepurchasesOrRedemptionPayable	9513000	usd
CY2022	slg	Share Repurchases Or Redemption Payable ShareRepurchasesOrRedemptionPayable	0	usd
CY2021	slg	Share Repurchases Or Redemption Payable ShareRepurchasesOrRedemptionPayable	0	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	57938000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	537344000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203273000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203273000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	251417000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	113696000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	113696000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	180781000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	180781000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	85567000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	335519000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	384054000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	336984000	usd
CY2021	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	4476000	usd
CY2023Q4	slg	Numberof Real Estate Buildings NumberofRealEstateBuildings	50	building
CY2023Q4	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	29695841	sqft
CY2023Q4	slg	Real Estate Weighted Average Leased Occupancy RealEstateWeightedAverageLeasedOccupancy	0.892
CY2023	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
CY2023	slg	Weighted Average Amortization Period Above Market Lease Costs WeightedAverageAmortizationPeriodAboveMarketLeaseCosts	P4Y8M12D
CY2023	slg	Weighted Average Amortization Period Below Market Lease Costs WeightedAverageAmortizationPeriodBelowMarketLeaseCosts	P8Y1M6D
CY2023	slg	Weighted Average Amortization Period In Place Lease Costs WeightedAverageAmortizationPeriodInPlaceLeaseCosts	P3Y1M6D
CY2023	slg	Period From Cessation Of Major Construction Activity To Completion Of Construction Project Maximum PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum	P1Y
CY2023	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	221000000	usd
CY2022	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	190100000	usd
CY2021	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	187300000	usd
CY2023	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	14200000	usd
CY2022	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	5700000	usd
CY2021	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	4200000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	189680000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	403552000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	184902000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	190066000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4778000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	213486000	usd
CY2023Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	205394000	usd
CY2022Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	361338000	usd
CY2023Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	202089000	usd
CY2022Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	212191000	usd
CY2023Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	3305000	usd
CY2022Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	149147000	usd
CY2023Q4	us-gaap	Marketable Securities MarketableSecurities	9591000	usd
CY2022Q4	us-gaap	Marketable Securities MarketableSecurities	11240000	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	7800000	usd
CY2022	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3700000	usd
CY2022	slg	Debt Securities Available For Sale Number Of Securities Repaid DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid	1	security
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	4500000	usd
CY2021	slg	Debt Securities Available For Sale Number Of Securities Repaid DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid	1	security
CY2022Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	0	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	0	usd
CY2021Q4	slg	Equity Securities Fvni Number Of Securities Sold EquitySecuritiesFVNINumberOfSecuritiesSold	1	marketablesecurity
CY2023	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	4200000	usd
CY2021	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	0	usd
CY2022	us-gaap	Marketable Securities Realized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments	-6500000	usd
CY2021	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	600000	usd
CY2023	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	6800000	usd
CY2022	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	6600000	usd
CY2021	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	6200000	usd
CY2023	slg	Operating Leases Estimated Average Lease Term OperatingLeasesEstimatedAverageLeaseTerm	P7Y
CY2023	slg	Financing Receivable Number Of Days Past Due For Suspending Income Recognition FinancingReceivableNumberOfDaysPastDueForSuspendingIncomeRecognition	P90D
CY2021Q3	slg	Equity Method Investment Ownership Percentage Deconsolidated EquityMethodInvestmentOwnershipPercentageDeconsolidated	0.510
CY2021Q3	us-gaap	Assets Fair Value Adjustment AssetsFairValueAdjustment	206800000	usd
CY2023	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	9200000	usd
CY2022	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	2600000	usd
CY2021	slg	Segment Operator Tax Expenses SegmentOperatorTaxExpenses	1000000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8200000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3700000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2800000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	3.25
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	6.17
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	8.09
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:6pt;text-align:justify;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.</span></div>
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Concentrations of Credit Risk</span></div><div style="margin-bottom:6pt;text-align:justify;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." </span></div>We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries.
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Reclassification</span></div><div style="margin-bottom:6pt;text-align:justify;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year balances have been reclassified to conform to our current year presentation.</span></div>As of December 31, 2023, the SUMMIT meets the criteria of a reportable operating segment pursuant to the guidance in ASC 280. Accordingly, we reclassified SUMMIT Operator revenue, SUMMIT Operator expenses, and SUMMIT Operator tax expense to separate financial statement line items in our consolidated statements of operations. These items were previously presented on a net basis in Other income. Additionally, the depreciation and amortization of SUMMIT assets are included in Depreciation and amortization in our consolidated statements of operations. Prior period balances have been reclassified to conform to the current period presentation.
CY2022	slg	Discontinued Operation Gain Loss On Disposal Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	investment dispositions
CY2021	slg	Discontinued Operation Gain Loss On Disposal Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	investment dispositions
CY2023	slg	Discontinued Operation Gain Loss On Disposal Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	investment dispositions
CY2023Q2	slg	Equity Method Investment Ownership Percentage Deconsolidated EquityMethodInvestmentOwnershipPercentageDeconsolidated	0.501
CY2023Q2	us-gaap	Assets Fair Value Adjustment AssetsFairValueAdjustment	17000000	usd
CY2022Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	623280000	usd
CY2023Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	0	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	0	usd
CY2022Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	623280000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1088723000	usd
CY2023	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	349947000	usd
CY2022	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	565940000	usd
CY2023	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	-6890000	usd
CY2022	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	0	usd
CY2023Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	346745000	usd
CY2022Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	623280000	usd
CY2023Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2023Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	346745000	usd
CY2023Q4	slg	Mortgage Loanson Real Estate Senior Financing MortgageLoansonRealEstateSeniorFinancing	1321858000	usd
CY2023Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	6630000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	6630000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	13213000	usd
CY2023	slg	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal Dpe Positions FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalDPEPositions	6890000	usd
CY2022	slg	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal Dpe Positions FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalDPEPositions	0	usd
CY2021	slg	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal Dpe Positions FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalDPEPositions	0	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	0	usd
CY2022	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	0	usd
CY2021	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	6583000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	13520000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	6630000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	6630000	usd
CY2023Q4	slg	Financing Receivable Nonaccrual No Allowance Number FinancingReceivableNonaccrualNoAllowanceNumber	1	loan
CY2023Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2022Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	1	investment
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	346745000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	0	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	346745000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	346745000	usd
CY2023Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2023	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2022	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2023	slg	Financing Receivable Recorded Investment Nonaccrual Status Number FinancingReceivableRecordedInvestmentNonaccrualStatusNumber	1	security
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	5600000	usd
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	0	usd
CY2023	srt	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.0868
CY2023Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	437900000	usd
CY2022Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	86200000	usd
CY2023Q2	slg	Equity Method Investment Ownership Percentage Deconsolidated EquityMethodInvestmentOwnershipPercentageDeconsolidated	0.501
CY2023Q2	us-gaap	Assets Fair Value Adjustment AssetsFairValueAdjustment	17000000	usd
CY2023Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	2000000	usd
CY2021Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	1400000	usd
CY2022Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	0	usd
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3190137000	usd
CY2023Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	545600000	usd
CY2023Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	399224000	usd
CY2022Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	407188000	usd
CY2023Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	287761000	usd
CY2022Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	286031000	usd
CY2023Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	111463000	usd
CY2022Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	121157000	usd
CY2023Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	1387386000	usd
CY2022Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	3165814000	usd
CY2023Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	110000000	usd
CY2022Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	70148000	usd
CY2023Q4	slg	Secured Debt Gross SecuredDebtGross	1497386000	usd
CY2022Q4	slg	Secured Debt Gross SecuredDebtGross	3235962000	usd
CY2023Q4	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	6067000	usd
CY2022Q4	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	8399000	usd
CY2023Q4	us-gaap	Secured Debt SecuredDebt	1491319000	usd
CY2022Q4	us-gaap	Secured Debt SecuredDebt	3227563000	usd
CY2023Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	1900000000	usd
CY2022Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	3800000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	587238000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	470000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	190148000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	2160000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	100000000	usd
CY2023Q4	slg	Long Term Debt Maturities Repayments Of Principal LongTermDebtMaturitiesRepaymentsOfPrincipal	3507386000	usd
CY2023	us-gaap	Interest Expense InterestExpense	228840000	usd
CY2022	us-gaap	Interest Expense InterestExpense	166493000	usd
CY2021	us-gaap	Interest Expense InterestExpense	145197000	usd
CY2023	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	4446000	usd
CY2022	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	4555000	usd
CY2021	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	5448000	usd
CY2023	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	95980000	usd
CY2022	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	82444000	usd
CY2021	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	78365000	usd
CY2023	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	2842000	usd
CY2022	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1855000	usd
CY2021	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	0	usd
CY2023	us-gaap	Interest Income Operating InterestIncomeOperating	3034000	usd
CY2022	us-gaap	Interest Income Operating InterestIncomeOperating	986000	usd
CY2021	us-gaap	Interest Income Operating InterestIncomeOperating	1389000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-137114000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-89473000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-70891000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-93024000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	434804000	usd
CY2023	us-gaap	Distributed Earnings DistributedEarnings	2655000	usd
CY2022	us-gaap	Distributed Earnings DistributedEarnings	2219000	usd
CY2021	us-gaap	Distributed Earnings DistributedEarnings	2398000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	usd
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	192000	usd
CY2023	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	-582164000	usd
CY2022	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	-95243000	usd
CY2023Q4	us-gaap	Other Receivables OtherReceivables	12168000	usd
CY2022Q4	us-gaap	Other Receivables OtherReceivables	27352000	usd
CY2023Q4	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2023Q4	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2023Q4	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	0	shares
CY2023Q4	us-gaap	Excess Stock Shares Outstanding ExcessStockSharesOutstanding	0	shares
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4474649	shares
CY2021	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	75.44
CY2022	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1971092	shares
CY2022	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	76.69
CY2023	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2023	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	0
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-579509000	usd
CY2021	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	432214000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	usd
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-2039000	usd
CY2023	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
CY2022	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
CY2021	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-192000	usd
CY2023	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	-37465000	usd
CY2023Q4	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther		usd
CY2022	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	-5794000	usd
CY2023Q4	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther		usd
CY2021	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	25457000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-619629000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-101037000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	459902000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63809000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63917000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65740000	shares
CY2023	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4163000	shares
CY2022	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4012000	shares
CY2021	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3987000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	705000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	0	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	0	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	337000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67972000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67929000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70769000	shares
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1273417	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1682236	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	948017	shares
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1273417	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1682236	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	948017	shares
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	33456000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1400000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1800000	usd
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CY2023Q4	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-400000	usd
CY2022Q4	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-500000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	9591000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	11240000	usd
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	57660000	usd
CY2023Q2	slg	Equity Method Investment Ownership Percentage Deconsolidated EquityMethodInvestmentOwnershipPercentageDeconsolidated	0.501
CY2023	us-gaap	Assets Fair Value Adjustment AssetsFairValueAdjustment	17000000	usd
CY2023Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	17500000	usd
CY2023Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	18300000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	25883000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	107945000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-3757000	usd
CY2023	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-58320000	usd
CY2022	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-4316000	usd
CY2021	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	25184000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	496311000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	470673000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	426247000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	371117000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	316789000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	1339758000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	3420895000	usd
CY2023	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	589469000	usd
CY2022	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	583107000	usd
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	608793000	usd
CY2023	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	79641000	usd
CY2022	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	82676000	usd
CY2021	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	73543000	usd
CY2023	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	669110000	usd
CY2022	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	665783000	usd
CY2021	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	682336000	usd
CY2023	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	14225000	usd
CY2022	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	5717000	usd
CY2021	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-4160000	usd
CY2023	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	683335000	usd
CY2022	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	671500000	usd
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	678176000	usd
CY2023	us-gaap	Sublease Income SubleaseIncome	196500000	usd
CY2022	us-gaap	Sublease Income SubleaseIncome	222100000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	3180000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	3228000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	3276000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	3325000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	3375000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	196794000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	213178000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	107544000	usd
CY2023Q4	us-gaap	Sales Type Lease Net Investment In Lease Excluding Accrued Interest Before Allowance For Credit Loss SalesTypeLeaseNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss	105634000	usd
CY2023	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	4444000	usd
CY2022	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	4389000	usd
CY2021	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	4422000	usd
CY2023	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	10091000	usd
CY2022	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	9145000	usd
CY2021	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	9176000	usd
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.15
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2022	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2022	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1800000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1500000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1500000	usd
CY2023Q4	slg	Employment Agreements Minimum Cash Based Compensation In Next Fiscal Year EmploymentAgreementsMinimumCashBasedCompensationInNextFiscalYear	2400000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3180000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	53455000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3228000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	53595000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	3276000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	53734000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	3325000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	53746000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	3375000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	54211000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	196794000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1208864000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	213178000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1477605000	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	107647000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	649913000	usd
CY2023Q4	slg	Finance Lease Liability Excluding Assets Held For Sale FinanceLeaseLiabilityExcludingAssetsHeldForSale	105531000	usd
CY2023Q4	slg	Operating Lease Liability Excluding Assets Held For Sale OperatingLeaseLiabilityExcludingAssetsHeldForSale	827692000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	105531000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	827692000	usd
CY2023	slg	Operating Lease Cost Before Capitalized Operating Lease Costs OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts	29637000	usd
CY2022	slg	Operating Lease Cost Before Capitalized Operating Lease Costs OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts	33773000	usd
CY2021	slg	Operating Lease Cost Before Capitalized Operating Lease Costs OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts	30270000	usd
CY2023	slg	Operating Lease Cost Capitalized OperatingLeaseCostCapitalized	2345000	usd
CY2022	slg	Operating Lease Cost Capitalized OperatingLeaseCostCapitalized	6830000	usd
CY2021	slg	Operating Lease Cost Capitalized OperatingLeaseCostCapitalized	3716000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	27292000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	26943000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	26554000	usd
CY2023	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	4446000	usd
CY2022	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	4555000	usd
CY2021	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	5448000	usd
CY2023	slg	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	0	usd
CY2022	slg	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	0	usd
CY2021	slg	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	0	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4446000	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4555000	usd
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5448000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	usd
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	660000	usd
CY2023	slg	Finance Lease Cost FinanceLeaseCost	4446000	usd
CY2023Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7056100000	usd
CY2022Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	9198799000	usd
CY2022	slg	Finance Lease Cost FinanceLeaseCost	4555000	usd
CY2021	slg	Finance Lease Cost FinanceLeaseCost	6108000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0446
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P28Y
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2023	us-gaap	Revenues Revenues	913710000	usd
CY2022	us-gaap	Revenues Revenues	919454000	usd
CY2021	us-gaap	Revenues Revenues	861310000	usd
CY2023	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	-599337000	usd
CY2022	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	-76303000	usd
CY2021	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	480632000	usd
CY2023Q4	us-gaap	Assets Assets	9531181000	usd
CY2022Q4	us-gaap	Assets Assets	12355794000	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	111400000	usd
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	93800000	usd
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	94900000	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2023Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	1497386000	usd
CY2023Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	1210669000	usd
CY2023Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	4495893000	usd
CY2023Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Land RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand	-117996000	usd
CY2023Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Building And Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements	1467536000	usd
CY2023Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	1092671000	usd
CY2023Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	5963429000	usd
CY2023Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7056100000	usd
CY2023Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2035311000	usd
CY2022Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	9198799000	usd
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7650907000	usd
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7355079000	usd
CY2023	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	usd
CY2022	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	1900042000	usd
CY2021	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	124103000	usd
CY2023	us-gaap	Real Estate Improvements RealEstateImprovements	241213000	usd
CY2022	us-gaap	Real Estate Improvements RealEstateImprovements	335413000	usd
CY2021	us-gaap	Real Estate Improvements RealEstateImprovements	296876000	usd
CY2023	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	2383912000	usd
CY2022	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	687563000	usd
CY2021	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	125151000	usd
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7650907000	usd
CY2023Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	4400000000	usd
CY2022Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2039554000	usd
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1896199000	usd
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1956077000	usd
CY2023	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	199576000	usd
CY2022	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	175465000	usd
CY2021	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	174219000	usd
CY2023	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	203819000	usd
CY2022	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	32110000	usd
CY2021	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	234097000	usd
CY2023Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2035311000	usd
CY2022Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2039554000	usd
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1896199000	usd
CY2022Q4	us-gaap	Line Of Credit LineOfCredit	443217000	usd
CY2022Q4	us-gaap	Unsecured Debt UnsecuredDebt	99692000	usd
CY2023Q4	us-gaap	Secured Debt SecuredDebt	1491319000	usd
CY2023	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	15486000	usd

Files In Submission

Name	View Source	Status
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0001040971-24-000010.txt	Edgar Link	pending
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$SLG
SL GREEN REALTY CORP Stock $slg

2024 Q1 Form 10-K Financial Statement

#000104097124000010 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG SL GREEN REALTY CORP Stock $slg

2024 Q1 Form 10-K Financial Statement

#000104097124000010 Filed on February 23, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL GREEN REALTY CORP Stock $slg