$SLG
SL Green Realty Corp Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000104097122000014 Filed on February 18, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$194.6M	$844.0M	$234.9M
YoY Change	-17.16%	-19.83%	-23.75%
Cost Of Revenue	$78.37M	$346.5M	$93.90M
YoY Change	-16.54%	-10.82%	-18.28%
Gross Profit	$116.2M	$497.4M	$141.0M
YoY Change	-17.58%	-25.11%	-27.02%
Gross Profit Margin	59.72%	58.94%	60.03%
Selling, General & Admin	$30.04M	$94.90M	$25.20M
YoY Change	19.22%	3.38%	-2.7%
% of Gross Profit	25.85%	19.08%	17.87%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$49.25M	$228.3M	$60.50M
YoY Change	-18.59%	-29.86%	-9.97%
% of Gross Profit	42.38%	45.89%	42.91%
Operating Expenses	$80.31M	$94.90M	$90.40M
YoY Change	-11.16%	3.38%	0.44%
Operating Profit	$35.90M	$402.5M	$50.60M
YoY Change	-29.05%	-29.67%	-50.97%
Interest Expense	-$66.51M	$145.2M	$151.7M
YoY Change	-143.84%	-21.91%	-354.1%
% of Operating Profit	-185.27%	36.07%	299.8%
Other Income/Expense, Net	-$18.10M	-$23.79M	-$53.80M
YoY Change	-66.36%	-60.67%
Pretax Income	-$48.18M	$480.6M	$200.3M
YoY Change	-124.05%	15.87%	724.28%
Income Tax		$2.800M
% Of Pretax Income		0.58%
Net Earnings	-$45.72M	$449.8M	$176.6M
YoY Change	-125.89%	21.21%	734.24%
Net Earnings / Revenue	-23.5%	53.29%	75.18%
Basic Earnings Per Share		$6.57
Diluted Earnings Per Share	-$810.5K	$6.50	$2.339M
COMMON SHARES
Basic Shares Outstanding	66.73M shares	65.74M shares	72.57M shares
Diluted Shares Outstanding		70.77M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$286.2M	$251.4M	$294.6M
YoY Change	-2.87%	-5.48%	50.35%
Cash & Equivalents	$251.4M	$251.4M	$266.1M
Short-Term Investments	$34.75M		$28.57M
Other Short-Term Assets
YoY Change
Inventory	$140.9M	$140.9M	$0.00
Prepaid Expenses
Receivables	$325.3M	$325.3M	$382.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$717.6M	$717.6M	$648.0M
YoY Change	10.74%	10.74%	-28.48%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.755B	$5.755B	$5.399B
YoY Change	6.59%	6.59%	-19.71%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$2.998B	$4.121B	$3.823B
YoY Change	-21.59%	-16.37%	31.26%
Other Assets	$210.1M	$210.1M	$284.0M
YoY Change	-26.03%	-26.03%	1.07%
Total Long-Term Assets	$10.35B	$10.35B	$11.06B
YoY Change	-6.42%	-6.43%	-6.75%
TOTAL ASSETS
Total Short-Term Assets	$717.6M	$717.6M	$648.0M
Total Long-Term Assets	$10.35B	$10.35B	$11.06B
Total Assets	$11.07B	$11.07B	$11.71B
YoY Change	-5.47%	-5.48%	-8.29%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$157.6M	$157.6M	$151.0M
YoY Change	4.35%	4.35%	-9.58%
Accrued Expenses	$864.1M	$864.1M	$354.0M
YoY Change	144.09%	144.09%	-12.38%
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	$1.261B	$1.261B	$708.0M
YoY Change	78.15%	78.15%	-0.7%
LONG-TERM LIABILITIES
Long-Term Debt	$4.120B	$4.120B	$5.081B
YoY Change	-18.91%	-18.91%	-8.5%
Other Long-Term Liabilities	$366.8M	$366.8M	$421.0M
YoY Change	-12.88%	-12.88%	44.67%
Total Long-Term Liabilities	$4.487B	$4.487B	$5.502B
YoY Change	-18.45%	-18.45%	-5.85%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.261B	$1.261B	$708.0M
Total Long-Term Liabilities	$4.487B	$4.487B	$5.502B
Total Liabilities	$5.748B	$6.106B	$6.211B
YoY Change	-7.46%	-7.43%	-5.26%
SHAREHOLDERS EQUITY
Retained Earnings	$975.8M		$1.015B
YoY Change	-3.91%		-6.38%
Common Stock	$672.0K		$716.0K
YoY Change	-6.15%		-10.83%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$126.2M		$124.0M
YoY Change	1.7%		0.0%
Treasury Stock Shares	1.027M shares		996.0K shares
Shareholders Equity	$4.765B	$4.961B	$4.910B
YoY Change
Total Liabilities & Shareholders Equity	$11.07B	$11.07B	$11.71B
YoY Change	-5.47%	-5.48%	-8.29%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	-$45.72M	$449.8M	$176.6M
YoY Change	-125.89%	21.21%	734.24%
Depreciation, Depletion And Amortization	$49.25M	$228.3M	$60.50M
YoY Change	-18.59%	-29.86%	-9.97%
Cash From Operating Activities	$64.97M	$256.0M	$226.3M
YoY Change	-71.29%	-53.81%	193.51%
INVESTING ACTIVITIES
Capital Expenditures	-$94.11M	-$455.3M	-$176.5M
YoY Change	-46.68%	-16.46%	70.86%
Acquisitions
YoY Change
Other Investing Activities	$200.8M	$1.449B	$857.9M
YoY Change	-76.59%	-9.53%	87.03%
Cash From Investing Activities	$106.7M	$993.6M	$681.4M
YoY Change	-84.34%	-5.95%	91.73%
FINANCING ACTIVITIES
Cash Dividend Paid		$271.1M
YoY Change		-7.8%
Common Stock Issuance & Retirement, Net		$341.4M
YoY Change		-35.4%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-180.6M	-$1.285B	-839.4M
YoY Change	-78.48%	-13.11%	105.94%
NET CHANGE
Cash From Operating Activities	64.97M	$256.0M	226.3M
Cash From Investing Activities	106.7M	$993.6M	681.4M
Cash From Financing Activities	-180.6M	-$1.285B	-839.4M
Net Change In Cash	-8.949M	-$35.81M	68.30M
YoY Change	-113.1%	-127.26%	174.3%
FREE CASH FLOW
Cash From Operating Activities	$64.97M	$256.0M	$226.3M
Capital Expenditures	-$94.11M	-$455.3M	-$176.5M
Free Cash Flow	$159.1M	$711.3M	$402.8M
YoY Change	-60.51%	-35.3%	123.28%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001040971
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	3671402000	USD
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-13199
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Entity Registrant Name EntityRegistrantName	SL GREEN REALTY CORP
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3956775
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Vanderbilt Avenue
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10017
CY2021	dei	City Area Code CityAreaCode	212
CY2021	dei	Local Phone Number LocalPhoneNumber	594-2700
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	4900000000	USD
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CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Location AuditorLocation	New York, New York
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CY2019	us-gaap	Interest Expense Other InterestExpenseOther	190521000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11424000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11794000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11653000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	216869000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	313668000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	272358000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2931000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	35298000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2021	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3773000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	503000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	729000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	94912000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	91826000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	100875000	USD
CY2021	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	747342000	USD
CY2020	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	958326000	USD
CY2019	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	1034764000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-55402000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-25195000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-34518000	USD
CY2021	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-32757000	USD
CY2020	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	2961000	USD
CY2019	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	76181000	USD
CY2021	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	210070000	USD
CY2020	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	187522000	USD
CY2021	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-23794000	USD
CY2020	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-60454000	USD
CY2019	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	69389000	USD
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	287417000	USD
CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	215506000	USD
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-16749000	USD
CY2019	slg	Depreciable Real Estate Reserves Effecton Earnings DepreciableRealEstateReservesEffectonEarnings	-7047000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1551000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	414758000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	291487000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	25457000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	20016000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	13301000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-1884000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	14940000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	-3159000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	7305000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	8747000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Preferred Unit Holders Redeemable NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable	10911000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	449754000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	371055000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	270434000	USD
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	434804000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	356105000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.29
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	255484000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.57
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.03
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.50
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.01
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.28
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65740000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	70397000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	77057000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70769000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	75078000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	81865000	shares
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	414758000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	291487000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	21427000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-39743000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-47118000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	104000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1318000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1249000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	21531000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-41061000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-45869000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	502163000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	373697000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	245618000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	30878000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	43703000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	21053000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	1042000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-2299000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-2276000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	470243000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	332293000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	226841000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5947855000	USD
CY2019	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	267275000	USD
CY2019	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	25845000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-43593000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	334000	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	471000	USD
CY2019	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-34320000	USD
CY2019	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	25763000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	384399000	USD
CY2019	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	58462000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	478000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.6434
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	279377000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5517198000	USD
CY2020	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	385995000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1536000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-38762000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1006000	USD
CY2020	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	8744000	USD
CY2020	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	32598000	USD
CY2020	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	25271000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	532262000	USD
CY2020	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	12477000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	78855000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.9374
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	341945000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935795000	USD
CY2021	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	447870000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	20489000	USD
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	14950000	USD
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	738000	USD
CY2021	slg	Reallocationof Noncontrolling Interest In Operating Partnership Increase Decrease ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease	-9851000	USD
CY2021	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	32583000	USD
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	337624000	USD
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	818000	USD
CY2021	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	336000	USD
CY2021	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	4476000	USD
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	6631000	USD
CY2021	us-gaap	Stock Issued During Period Value Stock Dividend StockIssuedDuringPeriodValueStockDividend	123529000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	6.2729
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	410373000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4778253000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	480632000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	414758000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	291487000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	228293000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	325462000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	284011000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-55402000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-25195000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-34518000	USD
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	824000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	679000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	864000	USD
CY2021	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-32757000	USD
CY2020	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	2961000	USD
CY2019	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	76181000	USD
CY2021	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	210070000	USD
CY2020	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	187522000	USD
CY2019	slg	Purchase Price Fair Value Adjustment Gain Loss PurchasePriceFairValueAdjustmentGainLoss	69389000	USD
CY2021	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-23794000	USD
CY2020	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-60454000	USD
CY2019	slg	Depreciable Real Estate Reserves Cash Flow Effect DepreciableRealEstateReservesCashFlowEffect	-7047000	USD
CY2021	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	287417000	USD
CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	215506000	USD
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	-16749000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2931000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	35298000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1551000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Straight Line Rent StraightLineRent	6701000	USD
CY2020	us-gaap	Straight Line Rent StraightLineRent	7582000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	13941000	USD
CY2021	slg	Non Cash Lease Expense NonCashLeaseExpense	17234000	USD
CY2020	slg	Non Cash Lease Expense NonCashLeaseExpense	11984000	USD
CY2019	slg	Non Cash Lease Expense NonCashLeaseExpense	13744000	USD
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-37164000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-15178000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-271000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	20561000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	17074000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4968000	USD
CY2021	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	8727000	USD
CY2020	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-1451000	USD
CY2019	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-7802000	USD
CY2021	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	10117000	USD
CY2020	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	20900000	USD
CY2019	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	70938000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20345000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	26137000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	18630000	USD
CY2021	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-66387000	USD
CY2020	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	132171000	USD
CY2019	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-25597000	USD
CY2021	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-1727000	USD
CY2020	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	20657000	USD
CY2019	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	10824000	USD
CY2021	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-33241000	USD
CY2020	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-11369000	USD
CY2019	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-11200000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	255979000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	554236000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	376473000	USD
CY2021	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	152791000	USD
CY2020	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	86846000	USD
CY2019	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	262591000	USD
CY2021	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	302486000	USD
CY2020	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	458140000	USD
CY2019	slg	Payments To Acquire Land Buildings And Improvements PaymentsToAcquireLandBuildingsAndImprovements	252986000	USD
CY2021	slg	Payments For Acquisition Deposits And Deferred Purchase Price PaymentsForAcquisitionDepositsAndDeferredPurchasePrice	0	USD
CY2020	slg	Payments For Acquisition Deposits And Deferred Purchase Price PaymentsForAcquisitionDepositsAndDeferredPurchasePrice	0	USD
CY2019	slg	Payments For Acquisition Deposits And Deferred Purchase Price PaymentsForAcquisitionDepositsAndDeferredPurchasePrice	5239000	USD
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	88872000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	70315000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	128682000	USD
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	770604000	USD
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	124572000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	79020000	USD
CY2021	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	651594000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2020	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	1112382000	USD
CY2019	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	208302000	USD
CY2021	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	9475000	USD
CY2020	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	0	USD
CY2019	slg	Proceeds From Consolidation Of Real Estate Investment ProceedsFromConsolidationOfRealEstateInvestment	0	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	4528000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	10000000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2021	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-40200000	USD
CY2020	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-32479000	USD
CY2019	slg	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	7869000	USD
CY2021	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	95695000	USD
CY2020	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	360953000	USD
CY2019	slg	Origination Of Debt And Preferred Equity Investments OriginationOfDebtAndPreferredEquityInvestments	607844000	USD
CY2021	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	167024000	USD
CY2020	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	763251000	USD
CY2019	slg	Repayments Or Redemption Of Debt And Preferred Equity Investments RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments	1092383000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	993581000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1056430000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	114494000	USD
CY2021	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	39689000	USD
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1181892000	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	752984000	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	375044000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	1186828000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	230076000	USD
CY2021	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1488000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1495000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1310000000	USD
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1808000000	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1875000000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1570000000	USD
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1556000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1006000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	334000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	341403000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	528483000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	384399000	USD
CY2021	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	6040000	USD
CY2020	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	82750000	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	18142000	USD
CY2021	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	25703000	USD
CY2020	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	27342000	USD
CY2019	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	27495000	USD
CY2021	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	6631000	USD
CY2020	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	85468000	USD
CY2019	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	478000	USD
CY2021	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	336000	USD
CY2020	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	12477000	USD
CY2019	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	10239000	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	1536000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	25845000	USD
CY2021	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	15749000	USD
CY2020	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	12652000	USD
CY2019	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	14729000	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	271075000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	293996000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	306386000	USD
CY2021	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	51862000	USD
CY2020	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	0	USD
CY2019	slg	Proceeds From Other Obligation Related To Secured Borrowing ProceedsFromOtherObligationRelatedToSecuredBorrowing	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2990000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4752000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3495000	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13745000	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	70036000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	21162000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	434000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	833000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1285371000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1479301000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-528650000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-35811000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	131365000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-37683000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	372795000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	241430000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	279113000	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
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	241430000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	152773000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	201348000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	248684000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	4405000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	2296000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	1489000	USD
CY2021	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	0	USD
CY2020	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	8744000	USD
CY2019	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	471000	USD
CY2021	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	27586000	USD
CY2020	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	0	USD
CY2019	slg	Redemption Of Units In Operating Partnership For Sale Of Joint Venture RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture	0	USD
CY2021	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	0	USD
CY2020	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	119497000	USD
CY2019	slg	Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture	0	USD
CY2021	us-gaap	Transfer Of Investments TransferOfInvestments	9468000	USD
CY2020	us-gaap	Transfer Of Investments TransferOfInvestments	122796000	USD
CY2019	us-gaap	Transfer Of Investments TransferOfInvestments	34498000	USD
CY2021	slg	Assumption Of Mortgage Loan AssumptionOfMortgageLoan	60000000	USD
CY2020	slg	Assumption Of Mortgage Loan AssumptionOfMortgageLoan	0	USD
CY2019	slg	Assumption Of Mortgage Loan AssumptionOfMortgageLoan	0	USD
CY2021	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	121418000	USD
CY2020	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	0	USD
CY2019	slg	Issuance Of Special Dividend Stock Dividend IssuanceOfSpecialDividendStockDividend	0	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	7580000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1665000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	6056000	USD
CY2021	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	9851000	USD
CY2020	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	32598000	USD
CY2019	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	34320000	USD
CY2021	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	66837000	USD
CY2020	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	854437000	USD
CY2019	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	395000	USD
CY2021	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	510000000	USD
CY2020	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	5593000	USD
CY2019	slg	Deconsolidation Of Subsidiary Mortgage DeconsolidationOfSubsidiaryMortgage	0	USD
CY2021	slg	Mortgages Assumed In Connection With Sale Of Real Estate MortgagesAssumedInConnectionWithSaleOfRealEstate	0	USD
CY2020	slg	Mortgages Assumed In Connection With Sale Of Real Estate MortgagesAssumedInConnectionWithSaleOfRealEstate	250000000	USD
CY2019	slg	Mortgages Assumed In Connection With Sale Of Real Estate MortgagesAssumedInConnectionWithSaleOfRealEstate	0	USD
CY2021	slg	Seller Financed Purchases SellerFinancedPurchases	0	USD
CY2020	slg	Seller Financed Purchases SellerFinancedPurchases	100000000	USD
CY2019	slg	Seller Financed Purchases SellerFinancedPurchases	0	USD
CY2021	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	8372000	USD
CY2020	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	9014000	USD
CY2019	slg	Debt And Preferred Equity Reserves DebtAndPreferredEquityReserves	0	USD
CY2021	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	140855000	USD
CY2020	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	0	USD
CY2019	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	391664000	USD
CY2021	slg	Reversal Of Assets Held For Sale ReversalOfAssetsHeldForSale	0	USD
CY2020	slg	Reversal Of Assets Held For Sale ReversalOfAssetsHeldForSale	391664000	USD
CY2019	slg	Reversal Of Assets Held For Sale ReversalOfAssetsHeldForSale	0	USD
CY2021	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	64120000	USD
CY2020	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	0	USD
CY2019	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	0	USD
CY2021	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	53548000	USD
CY2020	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	0	USD
CY2019	slg	Extinguishment Of Debt In Connection With Property Dispositions ExtinguishmentOfDebtInConnectionWithPropertyDispositions	0	USD
CY2021	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	119444000	USD
CY2020	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	0	USD
CY2019	slg	Consolidation Of Real Estate Investment ConsolidationOfRealEstateInvestment	0	USD
CY2021	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	19831000	USD
CY2020	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	66169000	USD
CY2019	slg	Removalof Fully Depreciated Real Estate Assets RemovalofFullyDepreciatedRealEstateAssets	19577000	USD
CY2021	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	4476000	USD
CY2020	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	0	USD
CY2019	slg	Sale Of Interest In Partially Owned Entity SaleOfInterestInPartiallyOwnedEntity	0	USD
CY2021	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	0	USD
CY2020	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	0	USD
CY2019	slg	Increase Decreasein Noncontrolling Interestin Joint Ventures IncreaseDecreaseinNoncontrollingInterestinJointVentures	48223000	USD
CY2021	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	358000	USD
CY2020	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	6613000	USD
CY2019	slg	Distributions To Noncontrolling Interests DistributionsToNoncontrollingInterests	0	USD
CY2021	slg	Share Repurchases Payable ShareRepurchasesPayable	0	USD
CY2020	slg	Share Repurchases Payable ShareRepurchasesPayable	3779000	USD
CY2019	slg	Share Repurchases Payable ShareRepurchasesPayable	0	USD
CY2021	slg	Recognition Of Sales Type Leases And Related Lease Liabilities RecognitionOfSalesTypeLeasesAndRelatedLeaseLiabilities	0	USD
CY2020	slg	Recognition Of Sales Type Leases And Related Lease Liabilities RecognitionOfSalesTypeLeasesAndRelatedLeaseLiabilities	119725000	USD
CY2019	slg	Recognition Of Sales Type Leases And Related Lease Liabilities RecognitionOfSalesTypeLeasesAndRelatedLeaseLiabilities	0	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	537344000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	61990000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	389120000	USD
CY2021Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3203
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3217
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.9387
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	251417000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	266059000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	166070000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	85567000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	106736000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	75360000	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
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	241430000	USD
CY2021Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3203
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3217
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.9387
CY2021Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	59	building
CY2021Q4	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	27716872	sqft
CY2021Q4	slg	Real Estate Weighted Average Occupancy RealEstateWeightedAverageOccupancy	0.916
CY2021	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
CY2021Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3203
CY2021	slg	Weighted Average Amortization Period Above Market Lease Costs WeightedAverageAmortizationPeriodAboveMarketLeaseCosts	P5Y1M6D
CY2021	slg	Weighted Average Amortization Period Below Market Lease Costs WeightedAverageAmortizationPeriodBelowMarketLeaseCosts	P14Y3M18D
CY2021	slg	Weighted Average Amortization Period In Place Lease Costs WeightedAverageAmortizationPeriodInPlaceLeaseCosts	P3Y9M18D
CY2021	slg	Period From Cessation Of Major Construction Activity To Completion Of Construction Project Maximum PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum	P1Y
CY2021	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	187300000	USD
CY2020	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	277500000	USD
CY2019	slg	Commercial Real Estate Properties Depreciationand Amortization CommercialRealEstatePropertiesDepreciationandAmortization	233500000	USD
CY2021	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	4200000	USD
CY2020	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	5900000	USD
CY2019	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	4500000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	199722000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	215673000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	182643000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	190523000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17079000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	25150000	USD
CY2021Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	212767000	USD
CY2020Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	230479000	USD
CY2021Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	2505000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	10930000	USD
CY2020Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	241409000	USD
CY2021Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	210262000	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
CY2020Q4	slg	Net Intangible Assets Transferredto Assets Heldfor Sale NetIntangibleAssetsTransferredtoAssetsHeldforSale	0	USD
CY2020Q4	slg	Net Intangible Liabilities Transferredto Liabilities Relatedto Assets Heldfor Sale NetIntangibleLiabilitiesTransferredtoLiabilitiesRelatedtoAssetsHeldforSale	0	USD
CY2021	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	600000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	4500000	USD
CY2021	slg	Debt Securities Available For Sale Number Of Securities Sold DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold	1	security
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2021	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	0	USD
CY2021	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	6200000	USD
CY2020	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	5400000	USD
CY2019	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	6300000	USD
CY2021	slg	Operating Leases Estimated Average Lease Term OperatingLeasesEstimatedAverageLeaseTerm	P7Y
CY2021	slg	Financing Receivable Number Of Days Past Due For Suspending Income Recognition FinancingReceivableNumberOfDaysPastDueForSuspendingIncomeRecognition	P90D
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2800000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1200000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1500000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	8.09
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	5.54
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	3.40
CY2021	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>
CY2021	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><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%">We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate </span></div>portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries.
CY2021	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>
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1076542000	USD
CY2019Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1580306000	USD
CY2021	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	201446000	USD
CY2020	us-gaap	Mortgage Loans On Real Estate Amortization Of Premium MortgageLoansOnRealEstateAmortizationOfPremium	1048643000	USD
CY2021	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	6583000	USD
CY2020	slg	Sec Schedule1229 Real Estate Companies Investment In Mortgage Loans On Real Estate Loan Loss Reserve Period Increase Decrease SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease	-11463000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1088723000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	1076542000	USD
CY2021Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1088723000	USD
CY2021Q4	slg	Mortgage Loanson Real Estate Senior Financing MortgageLoansonRealEstateSeniorFinancing	6626950000	USD
CY2020Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	13213000	USD
CY2019Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	1750000	USD
CY2018Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	5750000	USD
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	20693000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6583000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	37033000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4000000	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
CY2019Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	1750000	USD
CY2021Q4	slg	Financing Receivable Nonaccrual No Allowance Number FinancingReceivableNonaccrualNoAllowanceNumber	1	loan
CY2021Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	225400000	USD
CY2021Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	2	investment
CY2020Q4	slg	Number Of Investments Nonperforming NumberOfInvestmentsNonperforming	1	investment
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	27700000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	27700000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1088723000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1076542000	USD
CY2021Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	139873000	USD
CY2021Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	284821000	USD
CY2021Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	317753000	USD
CY2021Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	346276000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1088723000	USD
CY2020	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2021	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	27700000	USD
CY2021	srt	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.0652
CY2021Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	85600000	USD
CY2020Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	134000000	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	1400000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	0	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current And Noncurrent EmployeeRelatedLiabilitiesCurrentAndNoncurrent	4000000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3823322000	USD
CY2021Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	544400000	USD
CY2021Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	400419000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	447002000	USD
CY2021Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	275924000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	269834000	USD
CY2021Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	124495000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	177168000	USD
CY2021Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	1073409000	USD
CY2020Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	1083683000	USD
CY2021Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	361051000	USD
CY2020Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	917677000	USD
CY2021Q4	slg	Secured Debt Fixed And Floating Rate Amount SecuredDebtFixedAndFloatingRateAmount	1434460000	USD
CY2020Q4	slg	Secured Debt Fixed And Floating Rate Amount SecuredDebtFixedAndFloatingRateAmount	2001360000	USD
CY2021Q4	slg	Mortgages Reclassed To Liabilities Related To Assets Held For Sale MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale	34537000	USD
CY2020Q4	slg	Mortgages Reclassed To Liabilities Related To Assets Held For Sale MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale	0	USD
CY2021Q4	slg	Secured Debt Gross SecuredDebtGross	1399923000	USD
CY2020Q4	slg	Secured Debt Gross SecuredDebtGross	2001360000	USD
CY2021Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	5537000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	21388000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	1394386000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	1979972000	USD
CY2021Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	2100000000	USD
CY2020Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	2500000000	USD
CY2020Q4	us-gaap	Due From Related Parties DueFromRelatedParties	34657000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1257589000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	56583000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	538017000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100812000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	390841000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1730618000	USD
CY2021Q4	slg	Long Term Debt Maturities Repayments Of Principal LongTermDebtMaturitiesRepaymentsOfPrincipal	4074460000	USD
CY2021	us-gaap	Interest Expense InterestExpense	145197000	USD
CY2020	us-gaap	Interest Expense InterestExpense	185934000	USD
CY2019	us-gaap	Interest Expense InterestExpense	246848000	USD
CY2021	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	5448000	USD
CY2020	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	8091000	USD
CY2020Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	7651000	USD
CY2021Q4	us-gaap	Due From Related Parties DueFromRelatedParties	29408000	USD
CY2019	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	3243000	USD
CY2021	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	78365000	USD
CY2020	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	75167000	USD
CY2019	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	55446000	USD
CY2021	us-gaap	Interest Income Operating InterestIncomeOperating	1389000	USD
CY2020	us-gaap	Interest Income Operating InterestIncomeOperating	2179000	USD
CY2019	us-gaap	Interest Income Operating InterestIncomeOperating	4124000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-70891000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-116679000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-190521000	USD
CY2021Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	28204000	USD
CY2020Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	27006000	USD
CY2021Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	1204000	USD
CY2021Q4	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2021Q4	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2021Q4	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	0	shares
CY2021Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3203
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	8285460	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
CY2021	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	432214000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	434804000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	356105000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	255484000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	77057000	shares
CY2020	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	354283000	USD
CY2019	slg	Net Income Loss Available To Common Stockholders After Distributed And Undistributed Earnings Allocation Basic NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic	253784000	USD
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-2039000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-1685000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-1700000	USD
CY2021	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-192000	USD
CY2020	slg	Distributed Earnings Diluted DistributedEarningsDiluted	-137000	USD
CY2019	slg	Distributed Earnings Diluted DistributedEarningsDiluted	0	USD
CY2021	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	25457000	USD
CY2020	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	20016000	USD
CY2019	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	13301000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	459902000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	376121000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	268785000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65740000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	70397000	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1676825	shares
CY2021	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3987000	shares
CY2020	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4096000	shares
CY2019	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	4275000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	705000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	441000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	533000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	337000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	144000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	0	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	70769000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	75078000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	81865000	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	948017	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1676825	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1181014	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	948017	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1181014	shares
CY2021	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2100000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2200000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-43495000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	98000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-57361000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-18599000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3011000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-23500000	USD
CY2021Q4	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-600000	USD
CY2020Q4	slg	Other Comprehensive Income Loss Deferred Net Lossfrom Terminated Hedges OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges	-500000	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
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	28570000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	28000	USD
CY2021	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	0	USD
CY2020	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	-100000	USD
CY2019	slg	Accumulated Other Comprehensive Income Loss Gain Lossfrom Changesin Fair Value AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue	-100000	USD
CY2021Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	31300000	USD
CY2021Q4	us-gaap	Assets Needed For Immediate Settlement Aggregate Fair Value AssetsNeededForImmediateSettlementAggregateFairValue	31800000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-3757000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-59221000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-44229000	USD
CY2021	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	25184000	USD
CY2020	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	19480000	USD
CY2019	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	5000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	532046000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	485299000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	443632000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	415241000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	374661000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	1655647000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	3906526000	USD
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	600474000	USD
CY2020	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	702482000	USD
CY2021	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	73542000	USD
CY2020	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	96040000	USD
CY2021	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	674016000	USD
CY2020	slg	Operating Lease Lease Income Fixed And Variable Lease Payments OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments	798522000	USD
CY2021	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	4160000	USD
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	5901000	USD
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	678176000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	804423000	USD
CY2021	us-gaap	Sublease Income SubleaseIncome	229200000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	237900000	USD
CY2021	slg	Operating Leases Minimum Lease Term OperatingLeasesMinimumLeaseTerm	P1Y
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	3087000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	3133000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	3180000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	3228000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	3276000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	203494000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	219398000	USD
CY2021Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	116376000	USD
CY2021Q4	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	103022000	USD
CY2021	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	0	USD
CY2020	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	-6237000	USD
CY2021	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	4422000	USD
CY2020	us-gaap	Sales Type Lease Interest Income SalesTypeLeaseInterestIncome	1817000	USD
CY2021	us-gaap	Sales Type Lease Lease Income SalesTypeLeaseLeaseIncome	4422000	USD
CY2020	us-gaap	Sales Type Lease Lease Income SalesTypeLeaseLeaseIncome	-4420000	USD
CY2021	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	9176000	USD
CY2020	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	11097000	USD
CY2019	us-gaap	Multiemployer Plan Pension Significant Plan Contribution MultiemployerPlanPensionSignificantPlanContribution	14160000	USD
CY2021	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.15
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.04
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1500000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1700000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1600000	USD
CY2021Q4	slg	Employment Agreements Minimum Cash Based Compensation In Next Fiscal Year EmploymentAgreementsMinimumCashBasedCompensationInNextFiscalYear	3400000	USD
CY2021	slg	Operating Leases Minimum Lease Term OperatingLeasesMinimumLeaseTerm	P1Y
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3523000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	36776000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3570000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	48680000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	3641000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	54545000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	3810000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	54772000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	3858000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	54911000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	256691000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1395533000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	275093000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1645217000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	149563000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	786280000	USD
CY2021Q4	slg	Finance Lease Liability Excluding Assets Held For Sale FinanceLeaseLiabilityExcludingAssetsHeldForSale	125530000	USD
CY2021Q4	slg	Operating Lease Liability Excluding Assets Held For Sale OperatingLeaseLiabilityExcludingAssetsHeldForSale	858937000	USD
CY2021Q4	slg	Finance Lease Liability Reclassified To Liabilities Related To Assets Held For Sale FinanceLeaseLiabilityReclassifiedToLiabilitiesRelatedToAssetsHeldForSale	-22616000	USD
CY2021Q4	slg	Operating Lease Liability Reclassified To Liabilities To Assets Held For Sale OperatingLeaseLiabilityReclassifiedToLiabilitiesToAssetsHeldForSale	-7567000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	102914000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	851370000	USD
CY2021	slg	Operating Lease Cost Before Capitalized Operating Lease Costs OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts	30270000	USD
CY2020	slg	Operating Lease Cost Before Capitalized Operating Lease Costs OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts	32169000	USD
CY2021	slg	Operating Lease Cost Capitalized OperatingLeaseCostCapitalized	3716000	USD
CY2020	slg	Operating Lease Cost Capitalized OperatingLeaseCostCapitalized	3126000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	26554000	USD
CY2021	us-gaap	Revenues Revenues	843991000	USD
CY2020	us-gaap	Revenues Revenues	1052744000	USD
CY2019	us-gaap	Revenues Revenues	1238995000	USD
CY2020	slg	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	2378000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5448000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	29043000	USD
CY2021	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	5448000	USD
CY2020	slg	Finance Lease Interest Expense Before Capitalized Interest FinanceLeaseInterestExpenseBeforeCapitalizedInterest	8091000	USD
CY2021	slg	Finance Lease Interest Expense Capitalized FinanceLeaseInterestExpenseCapitalized	0	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5713000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	660000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1200000	USD
CY2021	slg	Finance Lease Cost FinanceLeaseCost	6108000	USD
CY2020	slg	Finance Lease Cost FinanceLeaseCost	6913000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0445
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P32Y
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2021	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	480632000	USD
CY2020	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	414758000	USD
CY2019	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	291487000	USD
CY2021Q4	us-gaap	Assets Assets	11066629000	USD
CY2020Q4	us-gaap	Assets Assets	11707567000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	94900000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	91800000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	100900000	USD
CY2021Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	1399923000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	1332556000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	4894397000	USD
CY2021Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Land RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand	18146000	USD
CY2021Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Building And Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements	1405807000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	1350701000	USD
CY2021Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	6300206000	USD
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7650907000	USD
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1896199000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7355079000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8784567000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8513935000	USD
CY2021	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	124103000	USD
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	178635000	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2021	us-gaap	Real Estate Improvements RealEstateImprovements	296876000	USD
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	481327000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	251674000	USD
CY2021	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	125151000	USD
CY2020	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	2089450000	USD
CY2019	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	-18958000	USD
CY2021Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7650907000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7355079000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8784567000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	222867000	USD
CY2021	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	234097000	USD
CY2020	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	375326000	USD
CY2021Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	8800000000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1956077000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2060560000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2099137000	USD
CY2021	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	174219000	USD
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	270843000	USD
CY2019	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	261444000	USD
CY2021Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1896199000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1956077000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2060560000	USD

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$SLG
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2021 Q4 Form 10-K Financial Statement

#000104097122000014 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG SL Green Realty Corp Stock $slg

2021 Q4 Form 10-K Financial Statement

#000104097122000014 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL Green Realty Corp Stock $slg