$SLG
SL Green Realty Corp Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2022 Q3 Form 10-Q Financial Statement

#000104097122000035 Filed on August 05, 2022

Income Statement

Concept	2022 Q3	2022 Q2	2022 Q1
Revenue	$212.5M	$201.4M	$188.0M
YoY Change	3.54%	-7.64%	-16.87%
Cost Of Revenue	$87.51M	$76.85M	$79.89M
YoY Change	10.24%	-18.55%	-15.37%
Gross Profit	$124.9M	$124.6M	$108.1M
YoY Change	-0.7%	0.68%	-17.94%
Gross Profit Margin	58.81%	61.85%	57.5%
Selling, General & Admin	$21.30M	$23.50M	$24.80M
YoY Change	-9.36%	6.33%	8.3%
% of Gross Profit	17.05%	18.86%	22.95%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$50.50M	$48.83M	$48.93M
YoY Change	-2.16%	-19.44%	-26.72%
% of Gross Profit	40.42%	39.19%	45.28%
Operating Expenses	$21.30M	$23.50M	$24.80M
YoY Change	-9.36%	6.33%	8.3%
Operating Profit	$103.6M	$101.1M	$83.27M
YoY Change	1.29%	-0.55%	-23.47%
Interest Expense	$40.55M	$32.56M	$32.05M
YoY Change	19.08%	-15.43%	-19.6%
% of Operating Profit	39.13%	32.21%	38.49%
Other Income/Expense, Net	$0.00	$0.00	$0.00
YoY Change		-100.0%	-100.0%
Pretax Income	$12.21M	-$37.95M	$13.49M
YoY Change	-97.06%	-132.4%	-445.77%
Income Tax	-$100.0K	$1.400M	$900.0K
% Of Pretax Income	-0.82%		6.67%
Net Earnings	$11.12M	-$40.14M	$11.49M
YoY Change	-97.16%	-136.8%	-408.35%
Net Earnings / Revenue	5.23%	-19.93%	6.11%
Basic Earnings Per Share	$0.11	-$0.70	$0.12
Diluted Earnings Per Share	$0.11	-$0.70	$0.11
COMMON SHARES
Basic Shares Outstanding	64.30M shares	63.80M shares	64.35M shares
Diluted Shares Outstanding	68.90M shares	69.02M shares	70.23M shares

Balance Sheet

Concept	2022 Q3	2022 Q2	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$217.8M	$215.6M	$256.6M
YoY Change	-25.5%	-13.98%	-21.97%
Cash & Equivalents	$201.3M	$189.4M	$223.7M
Short-Term Investments	$16.54M	$26.26M	$32.89M
Other Short-Term Assets
YoY Change
Inventory	$0.00	$0.00	$49.76M
Prepaid Expenses
Receivables	$321.2M	$318.2M	$323.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$522.4M	$507.6M	$596.4M
YoY Change	-11.88%	-15.27%	-13.06%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.456B	$5.479B	$5.762B
YoY Change	33.43%	-3.13%	-1.1%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$3.186B	$3.074B	$3.001B
YoY Change	5.21%	-4.21%	-18.86%
Other Assets	$299.8M	$206.5M	$205.9M
YoY Change	40.98%	-20.6%	-22.87%
Total Long-Term Assets	$12.19B	$10.20B	$10.42B
YoY Change	18.81%	-3.5%	-8.27%
TOTAL ASSETS
Total Short-Term Assets	$522.4M	$507.6M	$596.4M
Total Long-Term Assets	$12.19B	$10.20B	$10.42B
Total Assets	$12.72B	$10.70B	$11.01B
YoY Change	17.14%	-4.13%	-8.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$175.2M	$145.2M	$139.5M
YoY Change	27.01%	14.42%	16.22%
Accrued Expenses	$930.5M	$864.5M	$873.7M
YoY Change	103.1%	89.13%	82.79%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.181B	$1.089B	$1.091B
YoY Change	75.11%	64.18%	61.15%
LONG-TERM LIABILITIES
Long-Term Debt	$5.718B	$3.985B	$4.182B
YoY Change	34.23%	-17.45%	-23.56%
Other Long-Term Liabilities	$592.8M	$369.2M	$450.9M
YoY Change	113.29%	19.92%	16.52%
Total Long-Term Liabilities	$6.311B	$4.354B	$4.633B
YoY Change	39.07%	-15.21%	-20.91%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.181B	$1.089B	$1.091B
Total Long-Term Liabilities	$6.311B	$4.354B	$4.633B
Total Liabilities	$7.492B	$5.443B	$5.724B
YoY Change	43.74%	-6.13%	-12.42%
SHAREHOLDERS EQUITY
Retained Earnings	$755.9M	$780.0M	$846.6M
YoY Change	-39.93%	-16.5%	-7.78%
Common Stock	$655.0K	$655.0K	$653.0K
YoY Change	-3.68%	-5.07%	-7.38%
Preferred Stock
YoY Change
Treasury Stock (at cost)			$128.7M
YoY Change			3.71%
Treasury Stock Shares		1.060M shares	1.060M shares
Shareholders Equity	$4.688B	$4.684B	$4.726B
YoY Change
Total Liabilities & Shareholders Equity	$12.72B	$10.70B	$11.01B
YoY Change	17.14%	-4.13%	-8.54%

Cashflow Statement

Concept	2022 Q3	2022 Q2	2022 Q1
OPERATING ACTIVITIES
Net Income	$11.12M	-$40.14M	$11.49M
YoY Change	-97.16%	-136.8%	-408.35%
Depreciation, Depletion And Amortization	$50.50M	$48.83M	$48.93M
YoY Change	-2.16%	-19.44%	-26.72%
Cash From Operating Activities	$67.19M	$101.0M	$81.40M
YoY Change	-23.43%	19.33%	337.6%
INVESTING ACTIVITIES
Capital Expenditures	-$132.5M	-$65.28M	-$61.68M
YoY Change	-38.19%	-33.02%	25.11%
Acquisitions
YoY Change
Other Investing Activities	$270.5M	$187.1M	$75.18M
YoY Change	-41.16%	-73.97%	8.17%
Cash From Investing Activities	$138.0M	$121.8M	$13.50M
YoY Change	-43.76%	-80.39%	-33.13%
FINANCING ACTIVITIES
Cash Dividend Paid			$66.34M
YoY Change			-4.92%
Common Stock Issuance & Retirement, Net			$151.2M
YoY Change			79.81%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-97.17M	-253.1M	-$124.6M
YoY Change	-68.0%	-68.0%	1149.26%
NET CHANGE
Cash From Operating Activities	67.19M	101.0M	$81.40M
Cash From Investing Activities	138.0M	121.8M	$13.50M
Cash From Financing Activities	-97.17M	-253.1M	-$124.6M
Net Change In Cash	108.0M	-30.26M	-$29.67M
YoY Change	267.01%	-64.44%	-202.96%
FREE CASH FLOW
Cash From Operating Activities	$67.19M	$101.0M	$81.40M
Capital Expenditures	-$132.5M	-$65.28M	-$61.68M
Free Cash Flow	$199.7M	$166.3M	$143.1M
YoY Change	-33.9%	-8.69%	110.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Local Phone Number LocalPhoneNumber	594-2700
	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	Q2
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-06-30
	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 Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10017
	dei	City Area Code CityAreaCode	212
	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
CY2022Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	64300766	shares
CY2022Q2	us-gaap	Land Land	1209913000	usd
CY2021Q4	us-gaap	Land Land	1350701000	usd
CY2022Q2	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	3579961000	usd
CY2021Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	3671402000	usd
CY2022Q2	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1666935000	usd
CY2021Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1645081000	usd
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	983723000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	983723000	usd
CY2022Q2	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7440532000	usd
CY2021Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	7650907000	usd
CY2022Q2	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1961766000	usd
CY2021Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1896199000	usd
CY2022Q2	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5478766000	usd
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	5754708000	usd
CY2022Q2	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
CY2022Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	189360000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	251417000	usd
CY2022Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	87701000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	85567000	usd
CY2022Q2	us-gaap	Marketable Securities MarketableSecurities	26260000	usd
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	34752000	usd
CY2022Q2	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	40909000	usd
CY2021Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	47616000	usd
CY2022Q2	us-gaap	Due From Related Parties DueFromRelatedParties	27293000	usd
CY2021Q4	us-gaap	Due From Related Parties DueFromRelatedParties	29408000	usd
CY2022Q2	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	249998000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	262841000	usd
CY2021Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	248313000	usd
CY2022Q2	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	2482000	usd
CY2021Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	5057000	usd
CY2022Q2	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
CY2022Q2	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1134080000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1088723000	usd
CY2022Q2	us-gaap	Equity Method Investments EquityMethodInvestments	3074200000	usd
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2997934000	usd
CY2022Q2	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	118829000	usd
CY2021Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	124495000	usd
CY2022Q2	us-gaap	Other Assets OtherAssets	277487000	usd
CY2022Q2	us-gaap	Assets Assets	10704883000	usd
CY2021Q4	us-gaap	Assets Assets	11066629000	usd
CY2022Q2	us-gaap	Secured Debt SecuredDebt	1516921000	usd
CY2021Q4	us-gaap	Secured Debt SecuredDebt	1394386000	usd
CY2022Q2	us-gaap	Line Of Credit LineOfCredit	122407000	usd
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	381334000	usd
CY2022Q2	us-gaap	Senior Notes SeniorNotes	1242619000	usd
CY2021Q4	us-gaap	Senior Notes SeniorNotes	1242002000	usd
CY2022Q2	us-gaap	Unsecured Debt UnsecuredDebt	899658000	usd
CY2021Q4	us-gaap	Unsecured Debt UnsecuredDebt	899308000	usd
CY2022Q2	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	11862000	usd
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	12698000	usd
CY2022Q2	us-gaap	Other Liabilities OtherLiabilities	264876000	usd
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	195390000	usd
CY2022Q2	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	145237000	usd
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	157571000	usd
CY2022Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	104295000	usd
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	107275000	usd
CY2022Q2	us-gaap	Finance Lease Liability FinanceLeaseLiability	103561000	usd
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	102914000	usd
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	852614000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	851370000	usd
CY2022Q2	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	24456000	usd
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	187372000	usd
CY2022Q2	us-gaap	Security Deposit Liability SecurityDepositLiability	54696000	usd
CY2021Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	52309000	usd
CY2022Q2	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
CY2022Q2	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
CY2022Q2	us-gaap	Liabilities Liabilities	5443202000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	5748049000	usd
CY2022Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1027000	shares
CY2022Q2	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	334974000	usd
CY2021Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	344252000	usd
CY2022Q2	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
CY2022Q2	us-gaap	Preferred Stock Value PreferredStockValue	221932000	usd
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	221932000	usd
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2022Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65362000	shares
CY2022Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65362000	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	65132000	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	65132000	shares
CY2022Q2	us-gaap	Treasury Stock Shares TreasuryStockShares	1060000	shares
CY2022Q2	us-gaap	Common Stock Value CommonStockValue	655000	usd
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	672000	usd
CY2022Q2	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3801272000	usd
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3739409000	usd
CY2022Q2	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	128655000	usd
CY2021Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	126160000	usd
CY2022Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	8595000	usd
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-46758000	usd
CY2022Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	779999000	usd
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	975781000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	4683798000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	4764876000	usd
CY2022Q2	us-gaap	Nonredeemable Noncontrolling Interest NonredeemableNoncontrollingInterest	64966000	usd
CY2021Q4	us-gaap	Nonredeemable Noncontrolling Interest NonredeemableNoncontrollingInterest	13377000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4748764000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	usd
CY2022Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	10704883000	usd
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	11066629000	usd
CY2022Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	155232000	usd
CY2021Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	184611000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	311263000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	372700000	usd
CY2022Q2	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	20407000	usd
CY2021Q2	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	20107000	usd
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	40295000	usd
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	39380000	usd
CY2022Q2	us-gaap	Other Income OtherIncome	25806000	usd
CY2021Q2	us-gaap	Other Income OtherIncome	13389000	usd
	us-gaap	Other Income OtherIncome	37851000	usd
	us-gaap	Other Income OtherIncome	32129000	usd
CY2022Q2	us-gaap	Revenues Revenues	201445000	usd
CY2021Q2	us-gaap	Revenues Revenues	218107000	usd
	us-gaap	Revenues Revenues	389409000	usd
	us-gaap	Revenues Revenues	444209000	usd
CY2022Q2	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3172000	usd
	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	5695000	usd
CY2021Q2	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3039000	usd
	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	5264000	usd
CY2022Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	39557000	usd
CY2021Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	43883000	usd
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	82140000	usd
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	86167000	usd
CY2022Q2	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	30819000	usd
CY2021Q2	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	43768000	usd
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	61566000	usd
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	89179000	usd
CY2022Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	6477000	usd
CY2021Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	6707000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	13041000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	13446000	usd
CY2022Q2	us-gaap	Interest Expense Other InterestExpenseOther	14960000	usd
CY2021Q2	us-gaap	Interest Expense Other InterestExpenseOther	18960000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	30030000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	42348000	usd
CY2022Q2	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1917000	usd
CY2021Q2	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3386000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3865000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7160000	usd
CY2022Q2	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46914000	usd
CY2021Q2	us-gaap	Depreciation And Amortization DepreciationAndAmortization	57261000	usd
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	93897000	usd
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	120257000	usd
CY2022Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1000	usd
CY2021Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	29000	usd
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	25000	usd
CY2022Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	23522000	usd
CY2021Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22064000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	48298000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	44949000	usd
CY2022Q2	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	164167000	usd
CY2021Q2	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	196032000	usd
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	332866000	usd
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	403531000	usd
CY2022Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4550000	usd
CY2021Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-12970000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-9265000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-15834000	usd
CY2022Q2	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-131000	usd
CY2021Q2	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	8471000	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	-4158000	usd
CY2022Q2	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	-6168000	usd
CY2021Q2	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	-1947000	usd
	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	-6231000	usd
	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	717000	usd
CY2022Q2	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-64378000	usd
CY2021Q2	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	98960000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-65380000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	97572000	usd
CY2022Q2	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	0	usd
CY2021Q2	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	2545000	usd
	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	0	usd
	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-5696000	usd
CY2022Q2	us-gaap	Profit Loss ProfitLoss	-37949000	usd
CY2021Q2	us-gaap	Profit Loss ProfitLoss	117134000	usd
	us-gaap	Profit Loss ProfitLoss	-24464000	usd
	us-gaap	Profit Loss ProfitLoss	113279000	usd
CY2022Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-2813000	usd
CY2021Q2	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	6282000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	-2321000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	5806000	usd
CY2022Q2	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	3404000	usd
CY2021Q2	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-40000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	3261000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-1539000	usd
CY2022Q2	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	1599000	usd
CY2021Q2	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	3246000	usd
	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	3669000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	-40139000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	109069000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-28650000	usd
	us-gaap	Net Income Loss NetIncomeLoss	105343000	usd
CY2022Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3737000	usd
CY2021Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3737000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7475000	usd
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7475000	usd
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-43876000	usd
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105332000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-36125000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	97868000	usd
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.70
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.58
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.45
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.70
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.44
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63798000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66931000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63987000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66948000	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69020000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71672000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69422000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71838000	shares
CY2022Q2	us-gaap	Profit Loss ProfitLoss	-37949000	usd
CY2021Q2	us-gaap	Profit Loss ProfitLoss	117134000	usd
	us-gaap	Profit Loss ProfitLoss	-24464000	usd
	us-gaap	Profit Loss ProfitLoss	113279000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	17323000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-51313000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	60890000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-50000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	506000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-454000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2247000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	248000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16869000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-50807000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	58643000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	198000	usd
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-21080000	usd
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	66327000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	34179000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	113477000	usd
CY2022Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2190000	usd
CY2021Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	8065000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4186000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7936000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	1013000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-2841000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	3290000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-186000	usd
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-24283000	usd
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	61103000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	26703000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	105727000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	usd
CY2022Q1	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	11346000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	39497000	usd
CY2022Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
CY2022Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	89000	usd
CY2022Q1	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-43023000	usd
CY2022Q1	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	5056000	usd
CY2022Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	151197000	usd
CY2022Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	123000	usd
CY2022Q1	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	160620000	usd
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.932
CY2022Q1	us-gaap	Dividends Common Stock DividendsCommonStock	57665000	usd
CY2022Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4739115000	usd
CY2022Q2	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	-36735000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	15856000	usd
CY2022Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3737000	usd
CY2022Q2	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	110000	usd
CY2022Q2	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	37938000	usd
CY2022Q2	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	8475000	usd
CY2022Q2	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	51348000	usd
CY2022Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2897000	usd
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.932
CY2022Q2	us-gaap	Dividends Common Stock DividendsCommonStock	60709000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4748764000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935795000	usd
CY2021Q1	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	-5225000	usd
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	48350000	usd
CY2021Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3738000	usd
CY2021Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	351000	usd
CY2021Q1	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-26609000	usd
CY2021Q1	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	6728000	usd
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	80310000	usd
CY2021Q1	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	171000	usd
CY2021Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	110000	usd
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	123529000	usd
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.910
CY2021Q1	us-gaap	Dividends Common Stock DividendsCommonStock	63312000	usd
CY2021Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935620000	usd
CY2021Q2	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	109029000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-47966000	usd
CY2021Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3737000	usd
CY2021Q2	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	116000	usd
CY2021Q2	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-5866000	usd
CY2021Q2	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	7591000	usd
CY2021Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	118577000	usd
CY2021Q2	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	134000	usd
CY2021Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	63000	usd
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.910
CY2021Q2	us-gaap	Dividends Common Stock DividendsCommonStock	62524000	usd
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4813757000	usd
	us-gaap	Profit Loss ProfitLoss	-24464000	usd
	us-gaap	Profit Loss ProfitLoss	113279000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	97762000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	127417000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-9265000	usd
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-15834000	usd
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	343000	usd
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	174000	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	-4158000	usd
	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	-6231000	usd
	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	717000	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	-65380000	usd
	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	97572000	usd
	us-gaap	Straight Line Rent StraightLineRent	-1075000	usd
	us-gaap	Straight Line Rent StraightLineRent	7144000	usd
	slg	Non Cash Lease Expense NonCashLeaseExpense	12080000	usd
	slg	Non Cash Lease Expense NonCashLeaseExpense	7538000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	10406000	usd
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-18137000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2493000	usd
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-1458000	usd
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-14767000	usd
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	2055000	usd
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	6922000	usd
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	3602000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2651000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-15550000	usd
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	19767000	usd
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-60592000	usd
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-2672000	usd
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	888000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	1291000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-31232000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	182435000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	103264000	usd
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	0	usd
	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	28688000	usd
	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	126957000	usd
	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	118076000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	135365000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	38198000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	64976000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	417457000	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	398173000	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	0	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	-1507000	usd
	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	4108000	usd
	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	29095000	usd
	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	74148000	usd
	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	6405000	usd
	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	85106000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	135324000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	641521000	usd
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	184196000	usd
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	19772000	usd
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	91770000	usd
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	364994000	usd
	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	332000000	usd
	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	570000000	usd
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	592000000	usd
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	680000000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	199000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	467000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	151197000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	178666000	usd
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	17968000	usd
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	3631000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	18334000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	13930000	usd
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	3020000	usd
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	173000	usd
	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	51348000	usd
	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	305000	usd
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	8572000	usd
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	8110000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	131556000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	138373000	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	3891000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2842000	usd
	slg	Proceeds From Payments Of Financing Costs ProceedsFromPaymentsOfFinancingCosts	4991000	usd
	slg	Proceeds From Payments Of Financing Costs ProceedsFromPaymentsOfFinancingCosts	470000	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	-377682000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-801079000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-59923000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-56294000	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
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	277061000	usd
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	316501000	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	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	160620000	usd
	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	123529000	usd
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10295000	usd
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8911000	usd
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	5085000	usd
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	32475000	usd
	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	0	usd
	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	119444000	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	0	usd
	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	5184000	usd
	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	3597000	usd
	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	4288000	usd
	slg	Share Repurchases Payable ShareRepurchasesPayable	0	usd
	slg	Share Repurchases Payable ShareRepurchasesPayable	20221000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	119711000	usd
CY2022Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	189360000	usd
CY2021Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	218337000	usd
CY2022Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	87701000	usd
CY2021Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	98164000	usd
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	277061000	usd
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	316501000	usd
CY2022Q1	slg	Volume Weighted Average Share Price VolumeWeightedAverageSharePrice	79.71
CY2022Q2	slg	Numberof Real Estate Buildings NumberofRealEstateBuildings	50	building
CY2022Q2	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	27211821	sqft
CY2022Q2	slg	Real Estate Weighted Average Occupancy RealEstateWeightedAverageOccupancy	0.906
CY2022Q2	slg	Mortgage Loanson Real Estate Commercialand Consumer Net Including Debt Investments Other MortgageLoansonRealEstateCommercialandConsumerNetIncludingDebtInvestmentsOther	1200000000	usd
CY2022Q2	slg	Debt Investments Other DebtInvestmentsOther	100000000	usd
	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
CY2022Q2	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-200000	usd
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-300000	usd
CY2021Q2	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-1900000	usd
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	-3800000	usd
CY2022Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	189680000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	199722000	usd
CY2022Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	175519000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	182643000	usd
CY2022Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	14161000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17079000	usd
CY2022Q2	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	203523000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	212767000	usd
CY2022Q2	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	201325000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	210262000	usd
CY2022Q2	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	2198000	usd
CY2021Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	2505000	usd
CY2022Q2	slg	Net Intangible Assets Transferredto Assets Heldfor Sale NetIntangibleAssetsTransferredtoAssetsHeldforSale	0	usd
CY2022Q2	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
	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2022Q2	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-6200000	usd
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-6200000	usd
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-1900000	usd
CY2021Q2	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-1900000	usd
CY2021Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2022Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	5000000	usd
CY2021Q2	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1400000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2300000	usd
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	800000	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>
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	1134080000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	1088723000	usd
CY2022Q2	slg	Number Of Real Estate Properties Acquired NumberOfRealEstatePropertiesAcquired	0	property
	slg	Number Of Real Estate Properties Acquired NumberOfRealEstatePropertiesAcquired	0	property
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	6405000	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
CY2022Q2	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1134080000	usd
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1088723000	usd
CY2022Q2	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1134080000	usd
CY2022Q2	slg	Mortgage Loanson Real Estate Senior Financing MortgageLoansonRealEstateSeniorFinancing	6711949000	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
CY2022Q2	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
CY2022Q2	slg	Financing Receivable Nonaccrual No Allowance Number FinancingReceivableNonaccrualNoAllowanceNumber	1	loan
CY2022Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	225400000	usd
CY2021Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2022Q2	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2021	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2022Q2	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	689404000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	1134080000	usd
CY2022Q2	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	0	usd
CY2022Q2	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	144767000	usd
CY2022Q2	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	299909000	usd
CY2022Q2	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	8900000	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
CY2022Q2	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
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	0	usd
	srt	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.0651
CY2022Q2	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	88000000	usd
CY2021Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	85600000	usd
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2997934000	usd
CY2022Q2	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	553100000	usd
CY2022Q2	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	407589000	usd
CY2021Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	400419000	usd
CY2022Q2	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	288760000	usd
CY2021Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	275924000	usd
CY2022Q2	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	118829000	usd
CY2021Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	124495000	usd
CY2022Q2	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	835875000	usd
CY2021Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	1073409000	usd
CY2022Q2	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	690148000	usd
CY2021Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	361051000	usd
CY2022Q2	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	1526023000	usd
CY2021Q4	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	1434460000	usd
CY2022Q2	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
CY2022Q2	slg	Secured Debt Gross SecuredDebtGross	1526023000	usd
CY2021Q4	slg	Secured Debt Gross SecuredDebtGross	1399923000	usd
CY2022Q2	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	9102000	usd
CY2021Q4	slg	Secured Debt Deferred Finance Costs Net SecuredDebtDeferredFinanceCostsNet	5537000	usd
CY2022Q2	us-gaap	Secured Debt SecuredDebt	1516921000	usd
CY2021Q4	us-gaap	Secured Debt SecuredDebt	1394386000	usd
CY2022Q2	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	1900000000	usd
CY2021Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	2100000000	usd
CY2022Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	1012959000	usd
CY2022Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	55827000	usd
CY2022Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	537237000	usd
CY2022Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	470000000	usd
CY2022Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	usd
CY2022Q2	slg	Long Term Debt Maturity After Year Four LongTermDebtMaturityAfterYearFour	1830000000	usd
CY2022Q2	slg	Long Term Debt Maturities Repayments Of Principal LongTermDebtMaturitiesRepaymentsOfPrincipal	3906023000	usd
CY2022Q2	us-gaap	Interest Expense InterestExpense	32561000	usd
CY2021Q2	us-gaap	Interest Expense InterestExpense	38501000	usd
	us-gaap	Interest Expense InterestExpense	64613000	usd
	us-gaap	Interest Expense InterestExpense	78369000	usd
CY2022Q2	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	1116000	usd
CY2021Q2	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	1494000	usd
	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	2353000	usd
	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	2986000	usd
CY2022Q2	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	18351000	usd
CY2021Q2	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	20671000	usd
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	36292000	usd
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	38254000	usd
CY2022Q2	us-gaap	Interest Income Operating InterestIncomeOperating	366000	usd
CY2021Q2	us-gaap	Interest Income Operating InterestIncomeOperating	364000	usd
	us-gaap	Interest Income Operating InterestIncomeOperating	644000	usd
	us-gaap	Interest Income Operating InterestIncomeOperating	753000	usd
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-14960000	usd
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-18960000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-30030000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-42348000	usd
CY2022Q2	us-gaap	Due From Joint Ventures DueFromJointVentures	26314000	usd
CY2021Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	28204000	usd
CY2022Q2	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	979000	usd
CY2021Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	1204000	usd
CY2022Q2	us-gaap	Due From Related Parties DueFromRelatedParties	27293000	usd
CY2021Q4	us-gaap	Due From Related Parties DueFromRelatedParties	29408000	usd
CY2022Q2	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2022Q2	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2022Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2022Q2	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2022Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q2	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	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
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-43876000	usd
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105332000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-36125000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	97868000	usd
CY2022Q2	us-gaap	Distributed Earnings DistributedEarnings	497000	usd
CY2021Q2	us-gaap	Distributed Earnings DistributedEarnings	362000	usd
	us-gaap	Distributed Earnings DistributedEarnings	995000	usd
	us-gaap	Distributed Earnings DistributedEarnings	725000	usd
CY2022Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	usd
CY2021Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	261000	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	0	usd
CY2022Q2	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	-44373000	usd
CY2021Q2	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	104709000	usd
	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	-37120000	usd
	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	97143000	usd
CY2022Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1103000	usd
CY2021Q2	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-362000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	806000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-725000	usd
CY2022Q2	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
CY2021Q2	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-261000	usd
	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	usd
CY2022Q2	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	-2813000	usd
CY2021Q2	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	6282000	usd
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	-2321000	usd
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	5806000	usd
CY2022Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-48289000	usd
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	111614000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-40247000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	103674000	usd
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63798000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66931000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63987000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66948000	shares
CY2022Q2	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4102000	shares
CY2021Q2	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4093000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4112000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4121000	shares
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1120000	shares
CY2021Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	648000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1139000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	616000	shares
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	0	shares
CY2021Q2	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	184000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	153000	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69020000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71672000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69422000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	71838000	shares
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	528607	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	482130	shares
CY2021Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	964338	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1033173	shares
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-15800000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	14622000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-57918000	usd
CY2022Q2	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	600000	usd
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	900000	usd
CY2021Q2	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	1000000	usd
CY2022Q2	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
	slg	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Into Equity In Net Income CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsIntoEquityInNetIncome	-2000000.0	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	21899000	usd
CY2022Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	17493000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	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
	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
CY2022Q2	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	0	usd
CY2021Q2	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	0	usd
CY2022Q2	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	0	usd
CY2022Q2	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	0	usd
CY2022Q2	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	2701000	usd
CY2021Q2	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	6605000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	53307000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-12743000	usd
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	7583000	usd
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	12693000	usd
CY2022Q2	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	136673000	usd
CY2021Q2	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	165808000	usd
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	273255000	usd
	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	330487000	usd
CY2022Q2	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	18738000	usd
CY2021Q2	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	20695000	usd
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	38293000	usd
	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	45974000	usd
CY2022Q2	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	155411000	usd
CY2021Q2	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	186503000	usd
	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	311548000	usd
	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	376461000	usd
CY2022Q2	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-179000	usd
CY2021Q2	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-1892000	usd
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-285000	usd
	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-3761000	usd
CY2022Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	155232000	usd
CY2021Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	184611000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	311263000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	372700000	usd
CY2022Q2	us-gaap	Sublease Income SubleaseIncome	58000000	usd
	us-gaap	Sublease Income SubleaseIncome	114200000	usd
CY2021Q2	us-gaap	Sublease Income SubleaseIncome	66700000	usd
	us-gaap	Sublease Income SubleaseIncome	132500000	usd
CY2022Q2	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	1095000	usd
CY2021Q2	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	1105000	usd
	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	2187000	usd
	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	2205000	usd
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2022Q2	us-gaap	Revenues Revenues	201445000	usd
CY2021Q2	us-gaap	Revenues Revenues	218107000	usd
	us-gaap	Revenues Revenues	389409000	usd
	us-gaap	Revenues Revenues	444209000	usd
CY2022Q2	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	-37949000	usd
CY2021Q2	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	117134000	usd
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	-24464000	usd
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	113279000	usd
CY2022Q2	us-gaap	Assets Assets	10704883000	usd
CY2021Q4	us-gaap	Assets Assets	11066629000	usd
CY2022Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	23500000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	48300000	usd
CY2021Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22100000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	44900000	usd

Files In Submission

Name	View Source	Status
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$SLG
SL Green Realty Corp Stock $slg

2022 Q3 Form 10-Q Financial Statement

#000104097122000035 Filed on August 05, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG SL Green Realty Corp Stock $slg

2022 Q3 Form 10-Q Financial Statement

#000104097122000035 Filed on August 05, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL Green Realty Corp Stock $slg