$SLG
SL Green Realty Corp Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2022 Q4 Form 10-Q Financial Statement

#000104097122000044 Filed on November 04, 2022

Income Statement

Concept	2022 Q4	2022 Q3
Revenue	$224.9M	$212.5M
YoY Change	15.57%	3.54%
Cost Of Revenue	$94.98M	$87.51M
YoY Change	21.19%	10.24%
Gross Profit	$129.9M	$124.9M
YoY Change	11.78%	-0.7%
Gross Profit Margin	57.76%	58.81%
Selling, General & Admin	$24.31M	$21.30M
YoY Change	-19.08%	-9.36%
% of Gross Profit	18.72%	17.05%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$74.86M	$50.50M
YoY Change	51.98%	-2.16%
% of Gross Profit	57.63%	40.42%
Operating Expenses	$97.26M	$21.30M
YoY Change	21.1%	-9.36%
Operating Profit	$32.64M	$103.6M
YoY Change	-9.09%	1.29%
Interest Expense	-$66.99M	$40.55M
YoY Change	0.72%	19.08%
% of Operating Profit	-205.26%	39.13%
Other Income/Expense, Net	-$6.313M	$0.00
YoY Change	-65.12%
Pretax Income	-$64.05M	$12.21M
YoY Change	32.94%	-97.06%
Income Tax		-$100.0K
% Of Pretax Income		-0.82%
Net Earnings	-$64.98M	$11.12M
YoY Change	42.13%	-97.16%
Net Earnings / Revenue	-28.9%	5.23%
Basic Earnings Per Share		$0.11
Diluted Earnings Per Share	-$1.02	$0.11
COMMON SHARES
Basic Shares Outstanding	64.32M shares	64.30M shares
Diluted Shares Outstanding		68.90M shares

Balance Sheet

Concept	2022 Q4	2022 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$214.5M	$217.8M
YoY Change	-25.04%	-25.5%
Cash & Equivalents	$203.3M	$201.3M
Short-Term Investments	$11.24M	$16.54M
Other Short-Term Assets
YoY Change
Inventory	$0.00	$0.00
Prepaid Expenses
Receivables	$319.7M	$321.2M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$523.0M	$522.4M
YoY Change	-27.12%	-11.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.159B	$7.456B
YoY Change	24.41%	33.43%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$3.190B	$3.186B
YoY Change	6.41%	5.21%
Other Assets	$301.9M	$299.8M
YoY Change	43.74%	40.98%
Total Long-Term Assets	$11.83B	$12.19B
YoY Change	14.34%	18.81%
TOTAL ASSETS
Total Short-Term Assets	$523.0M	$522.4M
Total Long-Term Assets	$11.83B	$12.19B
Total Assets	$12.36B	$12.72B
YoY Change	11.65%	17.14%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$154.9M	$175.2M
YoY Change	-1.72%	27.01%
Accrued Expenses	$909.3M	$930.5M
YoY Change	5.24%	103.1%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.136B	$1.181B
YoY Change	-9.92%	75.11%
LONG-TERM LIABILITIES
Long-Term Debt	$5.616B	$5.718B
YoY Change	36.32%	34.23%
Other Long-Term Liabilities	$508.5M	$592.8M
YoY Change	38.63%	113.29%
Total Long-Term Liabilities	$6.125B	$6.311B
YoY Change	36.51%	39.07%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.136B	$1.181B
Total Long-Term Liabilities	$6.125B	$6.311B
Total Liabilities	$7.261B	$7.492B
YoY Change	26.32%	43.74%
SHAREHOLDERS EQUITY
Retained Earnings	$651.1M	$755.9M
YoY Change	-33.27%	-39.93%
Common Stock	$656.0K	$655.0K
YoY Change	-2.38%	-3.68%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares	1.060M shares
Shareholders Equity	$4.585B	$4.688B
YoY Change
Total Liabilities & Shareholders Equity	$12.36B	$12.72B
YoY Change	11.65%	17.14%

Cashflow Statement

Concept	2022 Q4	2022 Q3
OPERATING ACTIVITIES
Net Income	-$64.98M	$11.12M
YoY Change	42.13%	-97.16%
Depreciation, Depletion And Amortization	$74.86M	$50.50M
YoY Change	51.98%	-2.16%
Cash From Operating Activities	$26.46M	$67.19M
YoY Change	-59.27%	-23.43%
INVESTING ACTIVITIES
Capital Expenditures	$105.8M	-$132.5M
YoY Change	-212.4%	-38.19%
Acquisitions
YoY Change
Other Investing Activities	$258.3M	$270.5M
YoY Change	28.61%	-41.16%
Cash From Investing Activities	$152.5M	$138.0M
YoY Change	42.91%	-43.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-180.0M	-97.17M
YoY Change	-0.36%	-68.0%
NET CHANGE
Cash From Operating Activities	26.46M	67.19M
Cash From Investing Activities	152.5M	138.0M
Cash From Financing Activities	-180.0M	-97.17M
Net Change In Cash	-1.024M	108.0M
YoY Change	-88.56%	267.01%
FREE CASH FLOW
Cash From Operating Activities	$26.46M	$67.19M
Capital Expenditures	$105.8M	-$132.5M
Free Cash Flow	-$79.31M	$199.7M
YoY Change	-149.86%	-33.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10017
	dei	City Area Code CityAreaCode	212
	dei	Local Phone Number LocalPhoneNumber	594-2700
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Central Index Key EntityCentralIndexKey	0001040971
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-13199
	dei	Entity Registrant Name EntityRegistrantName	SL GREEN REALTY CORP
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3956775
	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Vanderbilt Avenue
	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	64316051	shares
CY2022Q3	us-gaap	Land Land	1715371000	usd
CY2021Q4	us-gaap	Land Land	1350701000	usd
CY2022Q3	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	5028486000	usd
CY2021Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	3671402000	usd
CY2022Q3	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1676811000	usd
CY2021Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1645081000	usd
CY2022Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1041661000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	983723000	usd
CY2022Q3	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	9462329000	usd
CY2021Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7650907000	usd
CY2022Q3	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	2005922000	usd
CY2021Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1896199000	usd
CY2022Q3	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	7456407000	usd
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5754708000	usd
CY2022Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	0	usd
CY2021Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	140855000	usd
CY2022Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	201267000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	251417000	usd
CY2022Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	183811000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	85567000	usd
CY2022Q3	us-gaap	Marketable Securities MarketableSecurities	16535000	usd
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	34752000	usd
CY2022Q3	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	41334000	usd
CY2021Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	47616000	usd
CY2022Q3	us-gaap	Due From Related Parties DueFromRelatedParties	27287000	usd
CY2021Q4	us-gaap	Due From Related Parties DueFromRelatedParties	29408000	usd
CY2022Q3	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	252555000	usd
CY2021Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	248313000	usd
CY2022Q3	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	1994000	usd
CY2021Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	5057000	usd
CY2022Q3	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	6630000	usd
CY2021Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	6630000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	663985000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1088723000	usd
CY2022Q3	us-gaap	Equity Method Investments EquityMethodInvestments	3185800000	usd
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2997934000	usd
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CY2021Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	124495000	usd
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CY2022Q3	us-gaap	Assets Assets	12716050000	usd
CY2021Q4	us-gaap	Assets Assets	11066629000	usd
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CY2021Q4	us-gaap	Secured Debt SecuredDebt	1394386000	usd
CY2022Q3	us-gaap	Line Of Credit LineOfCredit	442816000	usd
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	381334000	usd
CY2022Q3	us-gaap	Senior Notes SeniorNotes	1242994000	usd
CY2021Q4	us-gaap	Senior Notes SeniorNotes	1242002000	usd
CY2022Q3	us-gaap	Unsecured Debt UnsecuredDebt	599662000	usd
CY2021Q4	us-gaap	Unsecured Debt UnsecuredDebt	899308000	usd
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CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	12698000	usd
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CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	195390000	usd
CY2022Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	175203000	usd
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	157571000	usd
CY2022Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	280251000	usd
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	107275000	usd
CY2022Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	103888000	usd
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	102914000	usd
CY2022Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	911756000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	851370000	usd
CY2022Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	24362000	usd
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	187372000	usd
CY2022Q3	us-gaap	Security Deposit Liability SecurityDepositLiability	50926000	usd
CY2021Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	52309000	usd
CY2022Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	0	usd
CY2021Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	64120000	usd
CY2022Q3	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	usd
CY2021Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	usd
CY2022Q3	us-gaap	Liabilities Liabilities	7492143000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	5748049000	usd
CY2022Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
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CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	344252000	usd
CY2022Q3	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	177943000	usd
CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	196075000	usd
CY2022Q3	us-gaap	Preferred Stock Value PreferredStockValue	221932000	usd
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CY2022Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2022Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
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CY2022Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65376000	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65132000	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65132000	shares
CY2022Q3	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	1060000	shares
CY2021Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	1027000	shares
CY2022Q3	us-gaap	Common Stock Value CommonStockValue	655000	usd
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CY2022Q3	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	128655000	usd
CY2021Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	126160000	usd
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CY2022Q3	us-gaap	Stockholders Equity StockholdersEquity	4687654000	usd
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CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	usd
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CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	11066629000	usd
CY2022Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	162952000	usd
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	155363000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	474215000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	528063000	usd
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	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	69808000	usd
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	59452000	usd
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	us-gaap	Other Income OtherIncome	57842000	usd
	us-gaap	Other Income OtherIncome	61895000	usd
CY2022Q3	us-gaap	Revenues Revenues	212456000	usd
CY2021Q3	us-gaap	Revenues Revenues	205201000	usd
	us-gaap	Revenues Revenues	601865000	usd
	us-gaap	Revenues Revenues	649410000	usd
CY2022Q3	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	0	usd
	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	5695000	usd
CY2021Q3	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3563000	usd
	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	8827000	usd
CY2022Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	45011000	usd
CY2021Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	40684000	usd
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	127151000	usd
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	126851000	usd
CY2022Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	35111000	usd
CY2021Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	32139000	usd
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	96677000	usd
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	121318000	usd
CY2022Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	7388000	usd
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	6557000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	20429000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	20003000	usd
CY2022Q3	us-gaap	Interest Expense Other InterestExpenseOther	21824000	usd
CY2021Q3	us-gaap	Interest Expense Other InterestExpenseOther	14807000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	51854000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	57155000	usd
CY2022Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2043000	usd
CY2021Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2345000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5908000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	9505000	usd
CY2022Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	48462000	usd
CY2021Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	49277000	usd
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	142359000	usd
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	169534000	usd
CY2022Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	292000	usd
CY2021Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	190000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	321000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	215000	usd
CY2022Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	21276000	usd
CY2021Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	23477000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	69574000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	68426000	usd
CY2022Q3	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	181407000	usd
CY2021Q3	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	169476000	usd
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	514273000	usd
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	573007000	usd
CY2022Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-21997000	usd
CY2021Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-15487000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-31262000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-31321000	usd
CY2022Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	usd
CY2021Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-1280000	usd
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-131000	usd
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-5438000	usd
CY2022Q3	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	-1117000	usd
CY2021Q3	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	208810000	usd
	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	-7348000	usd
	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	209527000	usd
CY2022Q3	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	4276000	usd
CY2021Q3	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	187766000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-61104000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	285338000	usd
CY2022Q3	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	0	usd
CY2021Q3	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	0	usd
	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	0	usd
	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-5696000	usd
CY2022Q3	us-gaap	Profit Loss ProfitLoss	12211000	usd
CY2021Q3	us-gaap	Profit Loss ProfitLoss	415534000	usd
	us-gaap	Profit Loss ProfitLoss	-12253000	usd
	us-gaap	Profit Loss ProfitLoss	528813000	usd
CY2022Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	491000	usd
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	22683000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-1831000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	28489000	usd
CY2022Q3	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-993000	usd
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-915000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	2269000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-2454000	usd
CY2022Q3	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	1598000	usd
CY2021Q3	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	1823000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	4844000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	5492000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	11115000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	391943000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-17535000	usd
	us-gaap	Net Income Loss NetIncomeLoss	497286000	usd
CY2022Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
CY2021Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11213000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11213000	usd
CY2022Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7377000	usd
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	388205000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-28748000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	486073000	usd
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.95
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.29
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.91
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.47
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.24
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63949000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64856000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63971000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66248000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68897000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69496000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69249000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71049000	shares
CY2022Q3	us-gaap	Profit Loss ProfitLoss	12211000	usd
CY2021Q3	us-gaap	Profit Loss ProfitLoss	415534000	usd
	us-gaap	Profit Loss ProfitLoss	-12253000	usd
	us-gaap	Profit Loss ProfitLoss	528813000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	50488000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	6615000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	111378000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	6565000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1605000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	66000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-642000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	314000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	52093000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6681000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	110736000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6879000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	64304000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	422215000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	98483000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	535692000	usd
CY2022Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1096000	usd
CY2021Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	23591000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5282000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	31527000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	3114000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	415000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	6404000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	229000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	60094000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	398209000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	86797000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	503936000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4748764000	usd
CY2022Q3	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	10122000	usd
CY2022Q3	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	29817000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	48979000	usd
CY2022Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
CY2022Q3	us-gaap	Dividends Common Stock DividendsCommonStock	60138000	usd
CY2022Q3	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	140000	usd
CY2022Q3	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	28624000	usd
CY2022Q3	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	8616000	usd
CY2022Q3	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	817000	usd
CY2022Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	148000	usd
CY2022Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.932
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4752221000	usd
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4813757000	usd
CY2021Q3	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	391028000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6266000	usd
CY2021Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
CY2021Q3	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	146000	usd
CY2021Q3	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	15230000	usd
CY2021Q3	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	7932000	usd
CY2021Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	77957000	usd
CY2021Q3	us-gaap	Dividends Common Stock DividendsCommonStock	60748000	usd
	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	52164000	usd
CY2021Q3	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	5000	usd
CY2021Q3	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	4476000	usd
CY2021Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5230000	usd
CY2021Q3	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	0	usd
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.938
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5082215000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	usd
	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	-15266000	usd
	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	29817000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	104332000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11213000	usd
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	339000	usd
	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	23539000	usd
	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	22147000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	151197000	usd
	us-gaap	Dividends Common Stock DividendsCommonStock	178512000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4752221000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3168000	usd
	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	160620000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.797
	us-gaap	Profit Loss ProfitLoss	528813000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935795000	usd
	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	494832000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6650000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	11213000	usd
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	613000	usd
	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-17245000	usd
	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	22251000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	276844000	usd
	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	310000	usd
	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	4476000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5403000	usd
	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	123529000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.813
	us-gaap	Dividends Common Stock DividendsCommonStock	186584000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5082215000	usd
	us-gaap	Profit Loss ProfitLoss	-12253000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	148267000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	179039000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-31262000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-31321000	usd
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	448000	usd
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	719000	usd
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-131000	usd
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-5438000	usd
	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	-7348000	usd
	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	209527000	usd
	us-gaap	Straight Line Rent StraightLineRent	1371000	usd
	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	0	usd
	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-5696000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-61104000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	285338000	usd
	us-gaap	Straight Line Rent StraightLineRent	6963000	usd
	slg	Non Cash Lease Expense NonCashLeaseExpense	17332000	usd
	slg	Non Cash Lease Expense NonCashLeaseExpense	11670000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	11950000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-27868000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-7800000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	11827000	usd
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-5803000	usd
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	4626000	usd
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	10227000	usd
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	1267000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	146598000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	76471000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	35114000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	118000	usd
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	21345000	usd
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-54009000	usd
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	17208000	usd
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	7412000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	2495000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-33289000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	249628000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	191012000	usd
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	64491000	usd
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	152791000	usd
	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	194997000	usd
	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	208380000	usd
	slg	Payments For Proceeds From Acquisition Deposits And Deferred Purchase Price PaymentsForProceedsFromAcquisitionDepositsAndDeferredPurchasePrice	-75400000	usd
	slg	Payments For Proceeds From Acquisition Deposits And Deferred Purchase Price PaymentsForProceedsFromAcquisitionDepositsAndDeferredPurchasePrice	0	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	92217000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	749997000	usd
	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	353853000	usd
	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	541268000	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	60494000	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	0	usd
	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	9475000	usd
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	11465000	usd
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	4528000	usd
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	usd
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10000000	usd
	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-1619000	usd
	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-2401000	usd
	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	40053000	usd
	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	83924000	usd
	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	124405000	usd
	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	110774000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	273314000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	886877000	usd
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	381980000	usd
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	31219000	usd
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	290936000	usd
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	372300000	usd
	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1124000000	usd
	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	925000000	usd
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1364000000	usd
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1165000000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	339000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	613000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	151197000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	280623000	usd
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	17967000	usd
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	3631000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	35316000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	13930000	usd
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	3168000	usd
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	5403000	usd
	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	52164000	usd
	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	310000	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	29817000	usd
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	usd
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	12635000	usd
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	11882000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	197124000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	205131000	usd
	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	77874000	usd
	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	0	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3915000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2989000	usd
	slg	Proceeds From Payments Of Financing Costs ProceedsFromPaymentsOfFinancingCosts	5130000	usd
	slg	Proceeds From Payments Of Financing Costs ProceedsFromPaymentsOfFinancingCosts	570000	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	usd
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	434000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-474848000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1104751000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	48094000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-26862000	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
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	385078000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	345933000	usd
	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	0	usd
	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	27586000	usd
	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	190652000	usd
	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	0	usd
	us-gaap	Transfer Of Investments TransferOfInvestments	193995000	usd
	us-gaap	Transfer Of Investments TransferOfInvestments	9468000	usd
	slg	Assumption Of Mortgage And Mezzanine Loans AssumptionOfMortgageAndMezzanineLoans	1712750000	usd
	slg	Assumption Of Mortgage And Mezzanine Loans AssumptionOfMortgageAndMezzanineLoans	60000000	usd
	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	160620000	usd
	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	121418000	usd
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	18518000	usd
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	16684000	usd
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	23539000	usd
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	17245000	usd
	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	0	usd
	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	119444000	usd
	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	0	usd
	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	66837000	usd
	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	0	usd
	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	510000000	usd
	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	0	usd
	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	53548000	usd
	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	302000	usd
	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	8372000	usd
	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	4048000	usd
	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	7030000	usd
	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	0	usd
	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	358000	usd
	slg	Share Repurchases Payable ShareRepurchasesPayable	0	usd
	slg	Share Repurchases Payable ShareRepurchasesPayable	3779000	usd
	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	0	usd
	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	4476000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	57938000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	115812000	usd
CY2022Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	201267000	usd
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	257941000	usd
CY2022Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	183811000	usd
CY2021Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	87992000	usd
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	385078000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	345933000	usd
CY2022Q1	slg	Volume Weighted Average Share Price VolumeWeightedAverageSharePrice	79.71
CY2022Q3	slg	Numberof Real Estate Buildings NumberofRealEstateBuildings	52	building
CY2022Q3	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	30122545	sqft
CY2022Q3	slg	Real Estate Weighted Average Occupancy RealEstateWeightedAverageOccupancy	0.909
CY2022Q3	slg	Mortgage Loanson Real Estate Commercialand Consumer Net Including Debt Investments Other MortgageLoansonRealEstateCommercialandConsumerNetIncludingDebtInvestmentsOther	670600000	usd
CY2022Q3	slg	Debt Investments Other DebtInvestmentsOther	8500000	usd
	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
CY2022Q3	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-200000	usd
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-100000	usd
CY2021Q3	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-300000	usd
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-4000000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	403552000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	199722000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	179211000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	182643000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	224341000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17079000	usd
CY2022Q3	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	361338000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	212767000	usd
CY2022Q3	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	203064000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	210262000	usd
CY2022Q3	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	158274000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	2505000	usd
CY2022Q3	slg	Net Intangible Assets Transferredto Assets Heldfor Sale NetIntangibleAssetsTransferredtoAssetsHeldforSale	0	usd
CY2022Q3	slg	Net Intangible Liabilities Transferredto Liabilities Relatedto Assets Heldfor Sale NetIntangibleLiabilitiesTransferredtoLiabilitiesRelatedtoAssetsHeldforSale	0	usd
CY2021Q4	slg	Net Intangible Assets Transferredto Assets Heldfor Sale NetIntangibleAssetsTransferredtoAssetsHeldforSale	1800000	usd
CY2021Q4	slg	Net Intangible Liabilities Transferredto Liabilities Relatedto Assets Heldfor Sale NetIntangibleLiabilitiesTransferredtoLiabilitiesRelatedtoAssetsHeldforSale	0	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	12039000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	24146000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	4496000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	10606000	usd
CY2022Q3	us-gaap	Marketable Securities MarketableSecurities	16535000	usd
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	34752000	usd
CY2022Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	100000	usd
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-6100000	usd
CY2021Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	2000000	usd
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	100000	usd
CY2022Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	7800000	usd
CY2022Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	7800000	usd
	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2022Q3	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2022Q3	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3700000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3700000	usd
CY2022Q3	slg	Debt Securities Available For Sale Number Of Securities Repaid DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid	1	security
	slg	Debt Securities Available For Sale Number Of Securities Repaid DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid	1	security
CY2021Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	4500000	usd
	slg	Debt Securities Available For Sale Number Of Securities Repaid DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid	1	security
CY2022Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-100000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2200000	usd
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1500000	usd
	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>
	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.
	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>
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1088723000	usd
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1076542000	usd
	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	509052000	usd
CY2021	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	201446000	usd
	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	0	usd
CY2021	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	6583000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	663985000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1088723000	usd
CY2022Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	663985000	usd
CY2022Q3	slg	Mortgage Loanson Real Estate Senior Financing MortgageLoansonRealEstateSeniorFinancing	1913817000	usd
CY2021Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	6630000	usd
CY2020Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	13213000	usd
	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
CY2022Q3	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	6630000	usd
CY2021Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	6630000	usd
CY2022Q3	slg	Financing Receivable Nonaccrual No Allowance Number FinancingReceivableNonaccrualNoAllowanceNumber	1	loan
CY2022Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	225400000	usd
CY2022Q3	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	1	investment
CY2021Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	1	investment
CY2022Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	663985000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	1088723000	usd
CY2022Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	0	usd
CY2022Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	74390000	usd
CY2022Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	168223000	usd
CY2022Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	421372000	usd
CY2022Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	663985000	usd
CY2021	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2022Q3	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	9000000	usd
CY2021Q4	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	10500000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
CY2022Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
	srt	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.0632
CY2022Q3	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	87200000	usd
CY2021Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	85600000	usd
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2997934000	usd
CY2022Q3	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	538800000	usd
CY2022Q3	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	410655000	usd
CY2021Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	400419000	usd
CY2022Q3	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	294703000	usd
CY2021Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	275924000	usd
CY2022Q3	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	115952000	usd
CY2021Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	124495000	usd
CY2022Q3	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	2547242000	usd
CY2021Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	1073409000	usd
CY2022Q3	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	690148000	usd
CY2021Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	361051000	usd
CY2022Q3	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	3237390000	usd
CY2021Q4	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	1434460000	usd
CY2022Q3	slg	Mortgages Reclassed To Liabilities Related To Assets Held For Sale MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale	0	usd
CY2021Q4	slg	Mortgages Reclassed To Liabilities Related To Assets Held For Sale MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale	34537000	usd
CY2022Q3	slg	Secured Debt Gross SecuredDebtGross	3237390000	usd
CY2021Q4	slg	Secured Debt Gross SecuredDebtGross	1399923000	usd
CY2022Q3	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	8374000	usd
CY2021Q4	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	5537000	usd
CY2022Q3	us-gaap	Secured Debt SecuredDebt	3229016000	usd
CY2021Q4	us-gaap	Secured Debt SecuredDebt	1394386000	usd
CY2022Q3	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	3800000000	usd
CY2021Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	2100000000	usd
CY2022Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	711576000	usd
CY2022Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	55827000	usd
CY2022Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	537237000	usd
CY2022Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	470000000	usd
CY2022Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	usd
CY2022Q3	slg	Long Term Debt Maturity After Year Four LongTermDebtMaturityAfterYearFour	3862750000	usd
CY2022Q3	slg	Long Term Debt Maturities Repayments Of Principal LongTermDebtMaturitiesRepaymentsOfPrincipal	5637390000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	40553000	usd
CY2021Q3	us-gaap	Interest Expense InterestExpense	34054000	usd
	us-gaap	Interest Expense InterestExpense	105165000	usd
	us-gaap	Interest Expense InterestExpense	112423000	usd
CY2022Q3	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	1099000	usd
CY2021Q3	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	1229000	usd
	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	3453000	usd
	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	4215000	usd
CY2022Q3	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	19659000	usd
CY2021Q3	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	20141000	usd
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	55952000	usd
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	58395000	usd
CY2022Q3	us-gaap	Interest Income Operating InterestIncomeOperating	169000	usd
CY2021Q3	us-gaap	Interest Income Operating InterestIncomeOperating	335000	usd
	us-gaap	Interest Income Operating InterestIncomeOperating	812000	usd
	us-gaap	Interest Income Operating InterestIncomeOperating	1088000	usd
CY2022Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-21824000	usd
CY2021Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-14807000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-51854000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-57155000	usd
CY2022Q3	us-gaap	Due From Joint Ventures DueFromJointVentures	26539000	usd
CY2021Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	28204000	usd
CY2022Q3	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	748000	usd
CY2021Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	1204000	usd
CY2022Q3	us-gaap	Due From Related Parties DueFromRelatedParties	27287000	usd
CY2021Q4	us-gaap	Due From Related Parties DueFromRelatedParties	29408000	usd
CY2022Q3	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2022Q3	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2022Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2022Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q3	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2022Q3	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2022Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2022Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q3	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	0	shares
CY2022Q3	us-gaap	Excess Stock Shares Outstanding ExcessStockSharesOutstanding	0	shares
CY2022Q1	slg	Volume Weighted Average Share Price VolumeWeightedAverageSharePrice	79.71
CY2017	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	7865206	shares
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	107.81
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	9187480	shares
CY2018	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	102.06
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4333260	shares
CY2019	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	88.69
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	8276032	shares
CY2020	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	64.30
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4474649	shares
CY2021	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	75.44
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1971092	shares
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	76.69
CY2022Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7377000	usd
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	388205000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-28748000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	486073000	usd
CY2022Q3	us-gaap	Distributed Earnings DistributedEarnings	505000	usd
CY2021Q3	us-gaap	Distributed Earnings DistributedEarnings	357000	usd
	us-gaap	Distributed Earnings DistributedEarnings	1516000	usd
	us-gaap	Distributed Earnings DistributedEarnings	1071000	usd
CY2022Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	usd
CY2021Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1977000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1790000	usd
CY2022Q3	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	6872000	usd
CY2021Q3	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	385871000	usd
	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	-30264000	usd
	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	483212000	usd
CY2022Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-505000	usd
CY2021Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-357000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	484000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-1071000	usd
CY2022Q3	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1032243	shares
CY2021Q3	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-1977000	usd
	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-1790000	usd
CY2022Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	491000	usd
CY2021Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	22683000	usd
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	-1831000	usd
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	28489000	usd
CY2022Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	7868000	usd
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	410888000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-32579000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	514562000	usd
CY2022Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63949000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64856000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63971000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66248000	shares
CY2022Q3	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4088000	shares
CY2021Q3	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3834000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4104000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4024000	shares
CY2022Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	860000	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	806000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1052000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	676000	shares
CY2022Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	0	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	0	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	122000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	101000	shares
CY2022Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	68897000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69496000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69249000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71049000	shares
CY2022Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	621134	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	517574	shares
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	969631	shares
CY2022Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	500000	usd
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1400000	usd
CY2021Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	500000	usd
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1600000	usd
CY2022Q3	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-500000	usd
CY2021Q4	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-600000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	12039000	usd
CY2022Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	59285000	usd
CY2022Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	3592000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	24146000	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1896000	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	29912000	usd
CY2022Q3	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	1300000	usd
	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	1300000	usd
CY2021Q3	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	0	usd
	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	0	usd
CY2022Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	3600000	usd
CY2022Q3	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	3600000	usd
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-37600000	usd
	slg	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Into Equity In Net Income CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsIntoEquityInNetIncome	-8200000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	53411000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-593000	usd
CY2022Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-2923000	usd
CY2021Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	7208000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	106719000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-13336000	usd
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	4659000	usd
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	19901000	usd
CY2022Q3	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	142778000	usd
CY2021Q3	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	142979000	usd
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	416033000	usd
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	473466000	usd
CY2022Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	19990000	usd
CY2021Q3	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	12660000	usd
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	58283000	usd
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	58634000	usd
CY2022Q3	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	162768000	usd
CY2021Q3	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	155639000	usd
	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	474316000	usd
	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	532100000	usd
CY2022Q3	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	184000	usd
CY2021Q3	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-276000	usd
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-101000	usd
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-4037000	usd
CY2022Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	162952000	usd
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	155363000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	474215000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	528063000	usd
CY2022Q3	us-gaap	Sublease Income SubleaseIncome	55700000	usd
	us-gaap	Sublease Income SubleaseIncome	169900000	usd
CY2021Q3	us-gaap	Sublease Income SubleaseIncome	52000000	usd
	us-gaap	Sublease Income SubleaseIncome	175500000	usd
CY2022Q3	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	1099000	usd
CY2021Q3	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	1108000	usd
	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	3286000	usd
	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	3313000	usd
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2022Q3	us-gaap	Revenues Revenues	212456000	usd
CY2021Q3	us-gaap	Revenues Revenues	205201000	usd
	us-gaap	Revenues Revenues	601865000	usd
	us-gaap	Revenues Revenues	649410000	usd
CY2022Q3	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	12211000	usd
CY2021Q3	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	415534000	usd
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	-12253000	usd
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	528813000	usd
CY2022Q3	us-gaap	Assets Assets	12716050000	usd
CY2021Q4	us-gaap	Assets Assets	11066629000	usd
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2022Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	21300000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	69600000	usd
CY2021Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	23500000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	68400000	usd

Files In Submission

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$SLG
SL Green Realty Corp Stock $slg

2022 Q4 Form 10-Q Financial Statement

#000104097122000044 Filed on November 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

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$SLG SL Green Realty Corp Stock $slg

2022 Q4 Form 10-Q Financial Statement

#000104097122000044 Filed on November 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL Green Realty Corp Stock $slg