$SLG
SL Green Realty Corp Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000104746913001830 Filed on February 27, 2013

Income Statement

Concept	2012 Q4	2012	2011 Q4
Revenue	$346.6M	$1.290B	$328.9M
YoY Change	5.39%	3.46%	25.14%
Cost Of Revenue	$134.6M	$501.7M	$119.2M
YoY Change	12.92%	8.13%	18.25%
Gross Profit	$212.0M	$788.3M	$189.5M
YoY Change	11.87%	0.7%	16.98%
Gross Profit Margin	61.17%	61.11%	57.62%
Selling, General & Admin	$22.60M	$82.84M	$20.50M
YoY Change	10.24%	3.42%	-14.94%
% of Gross Profit	10.66%	10.51%	10.82%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$101.5M	$351.5M	$79.70M
YoY Change	27.35%	20.26%	28.55%
% of Gross Profit	47.88%	44.59%	42.06%
Operating Expenses	$114.8M	$82.84M	$89.30M
YoY Change	28.56%	3.42%	5.06%
Operating Profit	$97.20M	$705.5M	$100.2M
YoY Change	-2.99%	0.39%	30.13%
Interest Expense	-$72.50M	$311.2M	-$80.70M
YoY Change	-10.16%	8.35%	42.08%
% of Operating Profit	-74.59%	44.12%	-80.54%
Other Income/Expense, Net			-$5.800M
YoY Change			107.14%
Pretax Income	$17.70M	$59.40M	$13.70M
YoY Change	29.2%	-50.42%	-21.26%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income	0.0%	0.0%	0.0%
Net Earnings	$27.36M	$196.4M	$10.35M
YoY Change	164.35%	-69.66%	-30.06%
Net Earnings / Revenue	7.89%	15.22%	3.15%
Basic Earnings Per Share	$0.22	$1.75	$0.03
Diluted Earnings Per Share	$0.22	$1.74	$0.03
COMMON SHARES
Basic Shares Outstanding	90.37M shares	89.32M shares
Diluted Shares Outstanding		92.87M shares

Balance Sheet

Concept	2012 Q4	2012	2011 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$211.4M	$190.0M	$163.5M
YoY Change	29.29%	37.68%	-50.9%
Cash & Equivalents	$190.0M	$190.0M	$138.2M
Short-Term Investments	$21.43M		$25.32M
Other Short-Term Assets
YoY Change
Inventory	$5.000M	$5.000M
Prepaid Expenses
Receivables	$404.0M	$404.0M	$318.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$599.0M	$599.0M	$456.0M
YoY Change	31.36%	31.36%	-19.72%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.27B	$10.27B	$10.01B
YoY Change	2.59%	2.59%	25.55%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$1.032B	$2.402B	$893.9M
YoY Change	15.47%	26.09%	-45.12%
Other Assets	$397.0M	$397.0M	$374.0M
YoY Change	6.15%	6.15%	20.65%
Total Long-Term Assets	$13.79B	$13.79B	$13.03B
YoY Change	5.83%	5.83%	21.39%
TOTAL ASSETS
Total Short-Term Assets	$599.0M	$599.0M	$456.0M
Total Long-Term Assets	$13.79B	$13.79B	$13.03B
Total Assets	$14.39B	$14.39B	$13.48B
YoY Change	6.69%	6.69%	19.33%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$160.0M	$160.0M	$142.0M
YoY Change	12.68%	12.68%	6.77%
Accrued Expenses	$81.00M	$81.00M	$126.0M
YoY Change	-35.71%	-35.71%	231.58%
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	$346.0M	$346.0M	$361.0M
YoY Change	-4.16%	-4.16%	49.17%
LONG-TERM LIABILITIES
Long-Term Debt	$6.558B	$6.558B	$6.053B
YoY Change	8.34%	8.34%	14.9%
Other Long-Term Liabilities	$313.0M	$313.0M	$419.0M
YoY Change	-25.3%	-25.3%	36.04%
Total Long-Term Liabilities	$6.871B	$6.871B	$6.472B
YoY Change	6.17%	6.17%	16.07%
TOTAL LIABILITIES
Total Short-Term Liabilities	$346.0M	$346.0M	$361.0M
Total Long-Term Liabilities	$6.871B	$6.871B	$6.472B
Total Liabilities	$7.217B	$7.917B	$6.834B
YoY Change	5.61%	5.48%	6.42%
SHAREHOLDERS EQUITY
Retained Earnings	$1.556B		$1.705B
YoY Change	-8.71%
Common Stock	$913.0K		$892.0K
YoY Change	2.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$0.00		$308.7M
YoY Change	-100.0%
Treasury Stock Shares	3.646M shares		3.427M shares
Shareholders Equity	$6.420B	$6.469B	$5.976B
YoY Change
Total Liabilities & Shareholders Equity	$14.39B	$14.39B	$13.48B
YoY Change	6.69%	6.69%	19.33%

Cashflow Statement

Concept	2012 Q4	2012	2011 Q4
OPERATING ACTIVITIES
Net Income	$27.36M	$196.4M	$10.35M
YoY Change	164.35%	-69.66%	-30.06%
Depreciation, Depletion And Amortization	$101.5M	$351.5M	$79.70M
YoY Change	27.35%	20.26%	28.55%
Cash From Operating Activities	$76.60M	$346.8M	$75.20M
YoY Change	1.86%	12.91%	12.07%
INVESTING ACTIVITIES
Capital Expenditures	-$180.0M	-$692.7M	-$162.4M
YoY Change	10.84%	14.33%	16.25%
Acquisitions
YoY Change
Other Investing Activities	-$160.0M	-$470.7M	-$75.60M
YoY Change	111.64%	252.06%	358.18%
Cash From Investing Activities	-$340.0M	-$1.163B	-$238.1M
YoY Change	42.8%	58.53%	52.43%
FINANCING ACTIVITIES
Cash Dividend Paid		$121.2M
YoY Change		89.83%
Common Stock Issuance & Retirement, Net		-$187.1M
YoY Change		-63.36%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	291.0M	$868.4M	-93.40M
YoY Change	-411.56%	274.17%	-161.77%
NET CHANGE
Cash From Operating Activities	76.60M	$346.8M	75.20M
Cash From Investing Activities	-340.0M	-$1.163B	-238.1M
Cash From Financing Activities	291.0M	$868.4M	-93.40M
Net Change In Cash	27.60M	$51.79M	-256.3M
YoY Change	-110.77%	-126.61%	-512.72%
FREE CASH FLOW
Cash From Operating Activities	$76.60M	$346.8M	$75.20M
Capital Expenditures	-$180.0M	-$692.7M	-$162.4M
Free Cash Flow	$256.6M	$1.039B	$237.6M
YoY Change	8.0%	13.85%	14.89%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012Q2	dei	Entity Public Float EntityPublicFloat	6800000000	USD
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	91270393	shares
CY2012Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	11662953000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	10269630000	USD
CY2012Q4	us-gaap	Assets Assets	14387754000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	4314741000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	350000000	USD
CY2011Q4	us-gaap	Senior Notes SeniorNotes	1270656000	USD
CY2011Q4	slg	Accrued Interest Payable And Other AccruedInterestPayableAndOther	126135000	USD
CY2011Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	142428000	USD
CY2011Q4	us-gaap	Deferred Revenue DeferredRevenue	357193000	USD
CY2011Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	17112000	USD
CY2011Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	18495000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	28398000	USD
CY2011Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	46367000	USD
CY2011Q4	us-gaap	Liabilities Of Assets Held For Sale LiabilitiesOfAssetsHeldForSale	61988000	USD
CY2011Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	6833513000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Land Land	2684626000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	7147527000	USD
CY2011Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1302790000	USD
CY2011Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	12208000	USD
CY2011Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	11147151000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1136603000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	10010548000	USD
CY2011Q4	us-gaap	Assets Held For Sale At Carrying Value AssetsHeldForSaleAtCarryingValue	76562000	USD
CY2011Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	195030000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	892000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	138192000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	86584000	USD
CY2011Q4	us-gaap	Marketable Securities MarketableSecurities	25323000	USD
CY2011Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	32107000	USD
CY2011Q4	us-gaap	Due From Related Parties DueFromRelatedParties	4001000	USD
CY2011Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	281974000	USD
CY2011Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	985942000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	893933000	USD
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CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4236959000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	308708000	USD
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CY2011Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	16772000	USD
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CY2011Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	24996000	USD
CY2011Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	50175000	USD
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CY2010	us-gaap	Tenant Reimbursements TenantReimbursements	118212000	USD
CY2011	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	120418000	USD
CY2010	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	147926000	USD
CY2011	us-gaap	Other Income OtherIncome	35479000	USD
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CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	112239000	USD
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CY2011	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	498195000	USD
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CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	276607000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	7064000	USD
CY2010	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	35485000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	319156000	USD
CY2010	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	4574000	USD
CY2011	slg	Gain Loss On Sale Of Discontinued Operations Net Of Noncontrolling Interest Per Basic Share GainLossOnSaleOfDiscontinuedOperationsNetOfNoncontrollingInterestPerBasicShare	0.54
CY2010	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	14007000	USD
CY2010	slg	Gain Loss On Sale Of Discontinued Operations Net Of Noncontrolling Interest Per Basic Share GainLossOnSaleOfDiscontinuedOperationsNetOfNoncontrollingInterestPerBasicShare	0.45
CY2010	us-gaap	Net Income Loss NetIncomeLoss	300575000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.37
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.47
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	155984000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4145000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3938000	USD
CY2011	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	799000	USD
CY2010	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	269000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2731000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13487000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6077000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9818000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1530000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	208170000	USD
CY2011	slg	Purchase Price Fair Value Adjustments PurchasePriceFairValueAdjustments	498195000	USD
CY2011	us-gaap	Gain Loss On Sale Of Debt Investments GainLossOnSaleOfDebtInvestments	19840000	USD
CY2011	us-gaap	Straight Line Rent StraightLineRent	87230000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	6.70
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.30
CY2011	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	0.03
CY2010	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	1.62
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.07
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.09
CY2011	slg	Gain Loss On Sale Of Discontinued Operations Per Diluted Share GainLossOnSaleOfDiscontinuedOperationsPerDilutedShare	0.53
CY2010	slg	Gain Loss On Sale Of Discontinued Operations Per Diluted Share GainLossOnSaleOfDiscontinuedOperationsPerDilutedShare	0.44
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.33
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83762000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	78101000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	86244000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	79761000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	89319000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92873000	shares
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.18
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.17
CY2012	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	0.40
CY2012	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Basic Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerBasicShare	0.40
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.10
CY2012	slg	Gain Loss On Sale Of Discontinued Operations Net Of Noncontrolling Interest Per Basic Share GainLossOnSaleOfDiscontinuedOperationsNetOfNoncontrollingInterestPerBasicShare	0.07
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.75
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.10
CY2012	slg	Gain Loss On Sale Of Discontinued Operations Per Diluted Share GainLossOnSaleOfDiscontinuedOperationsPerDilutedShare	0.07
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	671045000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	328974000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	29712000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	18581000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-291000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-1061000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	641624000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	311454000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	185253000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	11185000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	27472000	USD
CY2010	us-gaap	Straight Line Rent StraightLineRent	47223000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2385000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	749000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	681000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	232099000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-350758000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	51792000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-4513000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4720000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-271000	USD
CY2011	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-2461000	USD
CY2010	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-2398000	USD
CY2011	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	38412000	USD
CY2010	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	42035000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4029000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4860000	USD
CY2011	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	10704000	USD
CY2010	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	-3706000	USD
CY2011	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	5586000	USD
CY2010	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-2242000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	312860000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	321058000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5486000	USD
CY2011	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	446756000	USD
CY2010	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	270614000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	159100000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	108145000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-29281000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	40215000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	109920000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	87844000	USD
CY2011	slg	Proceeds From Equity Method Investment Dividends Or Distributions ProceedsFromEquityMethodInvestmentDividendsOrDistributions	-112359000	USD
CY2010	slg	Proceeds From Equity Method Investment Dividends Or Distributions ProceedsFromEquityMethodInvestmentDividendsOrDistributions	-52920000	USD
CY2011	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	160548000	USD
CY2010	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	623121000	USD
CY2011	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	-12186000	USD
CY2010	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	-32607000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	-338195000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	-183015000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-739597000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	18815000	USD
CY2011	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	826000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	168360000	USD
CY2011	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	765378000	USD
CY2010	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	149832000	USD
CY2011	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	1901068000	USD
CY2010	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	670992000	USD
CY2011	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	2043144000	USD
CY2010	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	1046626000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	10211000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	14535000	USD
CY2011	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	143578000	USD
CY2010	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	13489000	USD
CY2010	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	2788000	USD
CY2010	slg	Redemption Of Noncontrolling Interest In Operating Partnership RedemptionOfNoncontrollingInterestInOperatingPartnership	13012000	USD
CY2011	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	727000	USD
CY2010	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	511000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	63866000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	58984000	USD
CY2011	slg	Proceeds From Participating Mortgage Loan ProceedsFromParticipatingMortgageLoan	35850000	USD
CY2011	slg	Deferred Loan Costs And Capitalized Lease Obligation DeferredLoanCostsAndCapitalizedLeaseObligation	35019000	USD
CY2010	slg	Deferred Loan Costs And Capitalized Lease Obligation DeferredLoanCostsAndCapitalizedLeaseObligation	47020000	USD
CY2011	us-gaap	Interest Paid InterestPaid	275106000	USD
CY2010	us-gaap	Interest Paid InterestPaid	222904000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	138000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	1041000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-194638000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-10885000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.08
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.55
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	516168000	USD
CY2010	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	122041000	USD
CY2012	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	200013000	USD
CY2011Q4	slg	Deferred Costs Gross DeferredCostsGross	352014000	USD
CY2012Q4	slg	Deferred Costs Gross DeferredCostsGross	438527000	USD
CY2012Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	177382000	USD
CY2011Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	141228000	USD
CY2012Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	261145000	USD
CY2012Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	66	property
CY2012Q4	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	29685079
CY2012Q4	slg	Real Estate Weighted Average Occupancy RealEstateWeightedAverageOccupancy	0.917	pure
CY2012Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1357203000	USD
CY2012	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
CY2012Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	152596000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	113620000	USD
CY2012Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	285931000	USD
CY2011Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	238394000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Use of Estimates</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        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.</font></p></div>
CY2012	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Concentrations of Credit Risk</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        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 in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in the New York Metropolitan area. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations 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 source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting the space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut, Northern New Jersey and the west coast. The tenants located in our buildings operate in various industries. Other than three tenants who account for approximately 6.9%, 6.4% and 6.0% of our share of annualized cash rent, respectively, no other tenant in our portfolio accounted for more than 1.9% of our annualized cash rent, including our share of joint venture annualized rent, at December 31, 2012. Approximately 10%, 8%, 7% and 6% of our annualized cash rent for consolidated properties was attributable to 1515 Broadway, 919 Third Avenue, 1185 Avenue of the Americas and One Madison Avenue, respectively, for the year ended December 31, 2012. Approximately 10%, 8%, 7% and 7% of our annualized cash rent for consolidated properties was attributable to 1515 Broadway, 919 Third Avenue, 1185 Avenue of the Americas and One Madison Avenue, respectively, for the year ended December 31, 2011. Approximately 10%, 9%, 7%, 7% and 6% of our annualized rent for consolidated properties was attributable to 919 Third Avenue, 1185 Avenue of the Americas, One Madison Avenue, 420 Lexington Avenue and 485 Lexington Avenue, respectively, for the year ended December 31, 2010. In addition, two debt and preferred equity investments accounted for more than 10.0% of the income earned on debt and preferred equity investments during 2012. As of December 31, 2012, approximately 74.8% of our workforce is covered by three collective bargaining agreements. Approximately 77.2% of our workforce which services substantially all of our properties is covered by a collective bargaining agreement which expires in 2015. See Note 15, "Employee Benefits."</font></p></div>
CY2012	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Reclassification</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to eliminate discontinued operations from income from continuing operations.</font></p></div>
CY2010	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	2800000	USD
CY2011	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	5800000	USD
CY2010	slg	Equity Method Investment Other Than Temporary Impairment Number EquityMethodInvestmentOtherThanTemporaryImpairmentNumber	1	investment
CY2011	slg	Equity Method Investment Other Than Temporary Impairment Number EquityMethodInvestmentOtherThanTemporaryImpairmentNumber	1	investment
CY2012	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	10500000	USD
CY2011	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	19800000	USD
CY2010	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	22700000	USD
CY2012	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	-1800000	USD
CY2011	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	-5900000	USD
CY2010	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	-2700000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	725861000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	263107000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	462754000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	673495000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	193442000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	480053000	USD
CY2012Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	651921000	USD
CY2012Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	357225000	USD
CY2012Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	294696000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	622029000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	290893000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	331136000	USD
CY2012	slg	Commericial Real Estate Properties Depreciation And Amortization CommericialRealEstatePropertiesDepreciationAndAmortization	306800000	USD
CY2011	slg	Commericial Real Estate Properties Depreciation And Amortization CommericialRealEstatePropertiesDepreciationAndAmortization	254500000	USD
CY2010	slg	Commericial Real Estate Properties Depreciation And Amortization CommericialRealEstatePropertiesDepreciationAndAmortization	207100000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	6900000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3300000	USD
CY2012	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	6800000	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	6200000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	2800000	USD
CY2012	us-gaap	Marketable Securities Realized Gain Loss MarketableSecuritiesRealizedGainLoss	4900000	USD
CY2011	us-gaap	Marketable Securities Realized Gain Loss MarketableSecuritiesRealizedGainLoss	4500000	USD
CY2010	us-gaap	Marketable Securities Realized Gain Loss MarketableSecuritiesRealizedGainLoss	1900000	USD
CY2012	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	11000000	USD
CY2011	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	9600000	USD
CY2010	slg	Deferred Lease Costs Capitalized In Period DeferredLeaseCostsCapitalizedInPeriod	8600000	USD
CY2012	slg	Operating Leases Estimated Average Lease Term OperatingLeasesEstimatedAverageLeaseTerm	P7Y
CY2012	slg	Financing Receivable Number Of Days Past Due For Suspending Income Recognition FinancingReceivableNumberOfDaysPastDueForSuspendingIncomeRecognition	P90D
CY2012	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2436000	USD
CY2011	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4370000	USD
CY2010	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3662000	USD
CY2012	slg	Minimum Percentage Of Taxable Income To Be Distributed As Dividend To Maintain Qualification As Reit MinimumPercentageOfTaxableIncomeToBeDistributedAsDividendToMaintainQualificationAsREIT	0.90	pure
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	900000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	12636000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Tenant Reimbursements DisposalGroupIncludingDiscontinuedOperationTenantReimbursements	873000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	60000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	13569000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1654000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Real Estate Tax Expense DisposalGroupIncludingDiscontinuedOperationRealEstateTaxExpense	1033000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	4253000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Amortization Of Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfFinancingCosts	172000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	676000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Marketing General And Administrative And Transaction Related Costs DisposalGroupIncludingDiscontinuedOperationMarketingGeneralAndAdministrativeAndTransactionRelatedCosts	1000	USD
CY2011	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	7789000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	22912000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Tenant Reimbursements DisposalGroupIncludingDiscontinuedOperationTenantReimbursements	4683000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	881000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	28476000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	7403000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Real Estate Tax Expense DisposalGroupIncludingDiscontinuedOperationRealEstateTaxExpense	4776000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	2998000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Amortization Of Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfFinancingCosts	883000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	5326000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Marketing General And Administrative And Transaction Related Costs DisposalGroupIncludingDiscontinuedOperationMarketingGeneralAndAdministrativeAndTransactionRelatedCosts	26000	USD
CY2010	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	21412000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	3357000	USD
CY2011	slg	Mortgage Loans On Real Estate Period Increase MortgageLoansOnRealEstatePeriodIncrease	622500000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Tenant Reimbursements DisposalGroupIncludingDiscontinuedOperationTenantReimbursements	31000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	8189000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	11577000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	714000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Real Estate Tax Expense DisposalGroupIncludingDiscontinuedOperationRealEstateTaxExpense	95000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	1410000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	82000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	2461000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	9116000	USD
CY2012	slg	Disposal Group Including Discontinued Operation Transaction Related Costs DisposalGroupIncludingDiscontinuedOperationTransactionRelatedCosts	160000	USD
CY2011Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	3431353000	USD
CY2011Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	942487000	USD
CY2011Q4	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	4373840000	USD
CY2011Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	7400000000	USD
CY2012Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	7600000000	USD
CY2012Q4	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	3457769000	USD
CY2012Q4	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	1157695000	USD
CY2012Q4	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	4615464000	USD
CY2012Q4	us-gaap	Longterm Debt Percentage Bearing Fixed Interest Amount LongtermDebtPercentageBearingFixedInterestAmount	4900000000	USD
CY2012Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	1600000000	USD
CY2012Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	511000	USD
CY2011Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	477000	USD
CY2012Q4	slg	Due To Joint Ventures DueToJointVentures	8401000	USD
CY2012Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	7020000	USD
CY2011Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	3524000	USD
CY2012Q4	us-gaap	Due From Related Parties DueFromRelatedParties	7531000	USD
CY2012	slg	Mortgage Loans On Real Estate Period Increase MortgageLoansOnRealEstatePeriodIncrease	672900000	USD
CY2012	slg	Mortgage Loans On Real Estate Period Decrease MortgageLoansOnRealEstatePeriodDecrease	298700000	USD
CY2011	slg	Mortgage Loans On Real Estate Period Decrease MortgageLoansOnRealEstatePeriodDecrease	589400000	USD
CY2012	us-gaap	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.0979	pure
CY2012Q4	slg	Mortgage Loans On Real Estate Senior Debt On Investment MortgageLoansOnRealEstateSeniorDebtOnInvestment	2899673000	USD
CY2010Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	61361000	USD
CY2009Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	93844000	USD
CY2012	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3000000	USD
CY2011	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10875000	USD
CY2010	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	24418000	USD
CY2012	slg	Financing Receivable Allowance For Credit Losses Write Offs And Reclassifications FinancingReceivableAllowanceForCreditLossesWriteOffsAndReclassifications	43739000	USD
CY2011	slg	Financing Receivable Allowance For Credit Losses Write Offs And Reclassifications FinancingReceivableAllowanceForCreditLossesWriteOffsAndReclassifications	17691000	USD
CY2010	slg	Financing Receivable Allowance For Credit Losses Write Offs And Reclassifications FinancingReceivableAllowanceForCreditLossesWriteOffsAndReclassifications	53239000	USD
CY2012	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2011	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2012Q4	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	121300000	USD
CY2011Q4	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	108700000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	102600000	USD
CY2011	slg	Financing Receivable Number90 Days Past Due And Still Accruing FinancingReceivableNumber90DaysPastDueAndStillAccruing	2	receivable
CY2011Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	17300000	USD
CY2012	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	50231000	USD
CY2012	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	3712000	USD
CY2011	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	191288000	USD
CY2011	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	9554000	USD
CY2012	slg	Variable Interest Entity Not Primary Beneficiary Number VariableInterestEntityNotPrimaryBeneficiaryNumber	3	entity
CY2012Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	117700000	USD
CY2011Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	161900000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4913129000	USD
CY2010	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	23344000	USD
CY2010	slg	Reallocation Minority Interest In Operating Partnerships ReallocationMinorityInterestInOperatingPartnerships	18948000	USD
CY2010	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	20000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	31741000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	76039000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3288000	USD
CY2010	slg	Minority Interest Increase From Contribution From Noncontrolling Interest Holders MinorityInterestIncreaseFromContributionFromNoncontrollingInterestHolders	2788000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	13494000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	31595000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5397544000	USD
CY2011	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	898000	USD
CY2011	slg	Reallocation Minority Interest In Operating Partnerships ReallocationMinorityInterestInOperatingPartnerships	39040000	USD
CY2011	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	-4787000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	33252000	USD
CY2011	slg	Common Stock Issued During Period Value New Issues CommonStockIssuedDuringPeriodValueNewIssues	531306000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	10037000	USD
CY2011	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	87798000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	143579000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	46649000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal First Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalFirstFullFiscalYear	348505000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Second Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalSecondFullFiscalYear	274686000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Third Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalThirdFullFiscalYear	285354000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Fourth Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalFourthFullFiscalYear	827218000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Fifth Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalFifthFullFiscalYear	1457791000	USD
CY2012Q4	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal After Fifth Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalAfterFifthFullFiscalYear	3326866000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	-6520420000	USD
CY2012	us-gaap	Interest Expense InterestExpense	332188000	USD
CY2012	us-gaap	Interest Income Operating InterestIncomeOperating	1619000	USD
CY2012	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-330569000	USD
CY2012	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	12218000	USD
CY2011	us-gaap	Interest Expense InterestExpense	287921000	USD
CY2010	us-gaap	Interest Expense InterestExpense	232794000	USD
CY2011	us-gaap	Interest Income Operating InterestIncomeOperating	2004000	USD
CY2010	us-gaap	Interest Income Operating InterestIncomeOperating	2146000	USD
CY2011	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-285917000	USD
CY2010	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-230648000	USD
CY2011	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	5123000	USD
CY2012Q4	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2012Q4	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2012Q4	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	649445000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	4100000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3400000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2200000	USD
CY2012	us-gaap	Real Estate Improvements RealEstateImprovements	146410000	USD
CY2012	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	280053000	USD
CY2012	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	5597000	USD
CY2011	us-gaap	Multiemployer Plans Plan Contributions MultiemployerPlansPlanContributions	14294000	USD
CY2010	us-gaap	Multiemployer Plans Plan Contributions MultiemployerPlansPlanContributions	11732000	USD
CY2012	slg	Defined Contribution Plan Employee Contribution Limit Percentage Of Compensation DefinedContributionPlanEmployeeContributionLimitPercentageOfCompensation	0.15	pure
CY2011	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	14629000	USD
CY2010	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	4574000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	631861000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	275400000	USD
CY2012	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3207000	shares
CY2011	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	1985000	shares
CY2010	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	1321000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	347000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	497000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	339000	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	627000	shares
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	288560000	USD
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	680000	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	804800	shares
CY2012	us-gaap	Multiemployer Plans Plan Contributions MultiemployerPlansPlanContributions	16551000	USD
CY2000	slg	Defined Contribution Plan Employer Matching Contribution Of Specified Percentage Of Annual Compensation DefinedContributionPlanEmployerMatchingContributionOfSpecifiedPercentageOfAnnualCompensation	0.50	pure
CY2000	slg	Defined Contribution Plan Employer Match Employee Contribution DefinedContributionPlanEmployerMatchEmployeeContribution	0.04	pure
CY2012	slg	Defined Contribution Plan Employer Matching Contribution Of Specified Percentage Of Annual Compensation DefinedContributionPlanEmployerMatchingContributionOfSpecifiedPercentageOfAnnualCompensation	0.50	pure
CY2011	slg	Defined Contribution Plan Employer Matching Contribution Of Specified Percentage Of Annual Compensation DefinedContributionPlanEmployerMatchingContributionOfSpecifiedPercentageOfAnnualCompensation	0.50	pure
CY2010	slg	Defined Contribution Plan Employer Matching Contribution Of Specified Percentage Of Annual Compensation DefinedContributionPlanEmployerMatchingContributionOfSpecifiedPercentageOfAnnualCompensation	0.50	pure
CY2012	slg	Defined Contribution Plan Employer Match Employee Contribution DefinedContributionPlanEmployerMatchEmployeeContribution	0.06	pure
CY2011	slg	Defined Contribution Plan Employer Match Employee Contribution DefinedContributionPlanEmployerMatchEmployeeContribution	0.06	pure
CY2010	slg	Defined Contribution Plan Employer Match Employee Contribution DefinedContributionPlanEmployerMatchEmployeeContribution	0.06	pure
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	561000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	502000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	450000	USD
CY2012Q4	slg	Employment Agreements Minimum Cash Based Compensation In Next Fiscal Year EmploymentAgreementsMinimumCashBasedCompensationInNextFiscalYear	4500000	USD
CY2012Q4	slg	Employment Agreements Deferred Compensation Awards Grant Date Value EmploymentAgreementsDeferredCompensationAwardsGrantDateValue	1000000	USD
CY2012	slg	Number Of Property Insurance Portfolios NumberOfPropertyInsurancePortfolios	2	portfolio
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	1555000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	1705000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	1743000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	1857000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	2007000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	99828000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	108695000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	71177000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	37518000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	37431000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	37531000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	37757000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	38315000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	38561000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1482791000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1672386000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	2000000	USD
CY2012Q4	slg	Accumulated Other Comprehensive Income Loss Gain Loss On Settlement Of Derivatives AccumulatedOtherComprehensiveIncomeLossGainLossOnSettlementOfDerivatives	-16800000	USD
CY2012Q4	slg	Accumulated Other Comprehensive Income Loss Derivative Contracts Held And Entitys Share Of Joint Venture Aoci AccumulatedOtherComprehensiveIncomeLossDerivativeContractsHeldAndEntitysShareOfJointVentureAOCI	-16100000	USD
CY2010Q1	slg	Gain Loss On Termination Of Derivative GainLossOnTerminationOfDerivative	-19500000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-32900000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-35400000	USD
CY2012	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	2100000	USD
CY2012	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	61238000	USD
CY2012	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	31840000	USD
CY2012	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	156904000	USD
CY2012	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-10594000	USD
CY2011	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-16049000	USD
CY2010	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-17619000	USD
CY2012	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-12657000	USD
CY2011	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-12625000	USD
CY2010	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-12661000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-847000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-82000	USD
CY2012	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-3000	USD
CY2011	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-16000	USD
CY2011	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	124144000	USD
CY2010	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	147686000	USD
CY2012	slg	Interest Cost Assumptions Leverage Rate InterestCostAssumptionsLeverageRate	1.00	pure
CY2012	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	88500000	USD
CY2011	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	85700000	USD
CY2010	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	87800000	USD
CY2012	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	37053000	USD
CY2012	us-gaap	Deferred Compensation Arrangement With Individual Fair Value Of Shares Issued DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued	722000	USD
CY2012	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	42239000	USD
CY2012	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	87513000	USD
CY2012	slg	Derivative Instruments Fair Value Adjustment DerivativeInstrumentsFairValueAdjustment	92000	USD
CY2012	us-gaap	Transfer Of Investments TransferOfInvestments	25362000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1738000	USD
CY2012	us-gaap	Notes Reduction NotesReduction	13750000	USD
CY2012	slg	Repayment Of Financing Receivables RepaymentOfFinancingReceivables	28195000	USD
CY2012	slg	Investment In Joint Venture InvestmentInJointVenture	5135000	USD
CY2011	us-gaap	Deferred Compensation Arrangement With Individual Fair Value Of Shares Issued DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued	699000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2012Q4	us-gaap	Revenues Revenues	350733000	USD
CY2011	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	62443000	USD
CY2012Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-67000	USD
CY2011	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	865000	USD
CY2011	slg	Derivative Instruments Fair Value Adjustment DerivativeInstrumentsFairValueAdjustment	1870000	USD
CY2011	us-gaap	Transfer Of Investments TransferOfInvestments	286571000	USD
CY2011	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	30000000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3990000	USD
CY2011	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	39040000	USD
CY2011	slg	Acquisition Liabilities Incurred But Not Yet Paid AcquisitionLiabilitiesIncurredButNotYetPaid	34500000	USD
CY2011	us-gaap	Loans Assumed1 LoansAssumed1	943767000	USD
CY2011	slg	Consolidation Of Real Estate Investments ConsolidationOfRealEstateInvestments	1156929000	USD
CY2011	slg	Consolidation Of Real Estate Investments Noncontrolling Interest In Other Partnerships ConsolidationOfRealEstateInvestmentsNoncontrollingInterestInOtherPartnerships	87264000	USD
CY2012Q4	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	31698000	USD
CY2011Q4	us-gaap	Revenues Revenues	328877000	USD
CY2011Q3	us-gaap	Revenues Revenues	306624000	USD
CY2011Q2	us-gaap	Revenues Revenues	298705000	USD
CY2011Q1	us-gaap	Revenues Revenues	329222000	USD
CY2011Q4	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	1833000	USD
CY2011Q3	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	9544000	USD
CY2011Q2	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	10176000	USD
CY2011Q1	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	72898000	USD
CY2011Q4	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-114000	USD
CY2011Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	3032000	USD
CY2011Q4	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	8306000	USD
CY2011Q3	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	999000	USD
CY2011Q2	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	475102000	USD
CY2011Q1	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	13788000	USD
CY2011Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-67000	USD
CY2011Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	971000	USD
CY2011Q4	slg	Depreciable Real Estate Reserves DepreciableRealEstateReserves	-5789000	USD
CY2011Q4	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1116000	USD
CY2011Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1116000	USD
CY2011Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1675000	USD
CY2011Q1	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1873000	USD
CY2011Q2	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	46085000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	10351000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	14624000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	534003000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	88432000	USD
CY2011Q4	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7543000	USD
CY2011Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7545000	USD
CY2011Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7545000	USD
CY2011Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7545000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2808000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7079000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	526458000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	80887000	USD
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.30
CY2012Q4	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	3235000	USD
CY2012Q4	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7407000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5786000	USD
CY2012Q4	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	19277000	USD
CY2012Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6978000	USD
CY2012Q4	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	9126000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	27363000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19956000	USD
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2012Q3	us-gaap	Revenues Revenues	361385000	USD
CY2012Q3	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	28010000	USD
CY2012Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-4807000	USD
CY2012Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	217000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	25657000	USD
CY2012Q3	slg	Preferred Stock Redemption Costs PreferredStockRedemptionCosts	10010000	USD
CY2012Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7915000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7732000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2012Q2	us-gaap	Revenues Revenues	349004000	USD
CY2012Q2	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	95328000	USD
CY2012Q2	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	15323000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	110584000	USD
CY2012Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7544000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	103040000	USD
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.14
CY2012Q1	us-gaap	Revenues Revenues	339133000	USD
CY2012Q1	slg	Income Loss From Continuing Operations Attributable To Parent Before Gains Losses On Sales And Income Taxes IncomeLossFromContinuingOperationsAttributableToParentBeforeGainsLossesOnSalesAndIncomeTaxes	19074000	USD
CY2012Q1	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	7260000	USD
CY2012Q1	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-160000	USD
CY2012Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	6627000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	32801000	USD
CY2012Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7545000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25256000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	11147151000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8890064000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8257100000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1136603000	USD
CY2010Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	916293000	USD
CY2009Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	738422000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	11662953000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1393323000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	2276308000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	703721000	USD
CY2011	us-gaap	Real Estate Improvements RealEstateImprovements	162875000	USD
CY2010	us-gaap	Real Estate Improvements RealEstateImprovements	97099000	USD
CY2011	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	182096000	USD
CY2010	slg	Real Estate Cost Of Real Estate Sold Retired Or Deconsolidated RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated	167856000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	245421000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	209472000	USD
CY2011	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	25111000	USD
CY2010	slg	Real Estate Accumulated Depreciation Real Estate Sold Retired Or Deconsolidated RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated	31601000	USD
CY2012Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	8300000000	USD
CY2012Q4	us-gaap	Liabilities Of Assets Held For Sale LiabilitiesOfAssetsHeldForSale	136000	USD
CY2012Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	48544000	USD
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.26
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	6627000	USD
CY2012	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	5597000	USD
CY2012	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	5591000	USD
CY2010	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-1329000	USD
CY2010	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	314582000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	7218194000	USD
CY2012Q4	us-gaap	Other Minority Interests OtherMinorityInterests	487301000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1142000	USD
CY2012Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	340747000	USD
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	87513000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1032243000	USD
CY2011	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	662493000	USD
CY2012	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	201996000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	718326000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	37839000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	136071000	USD
CY2012Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	212907000	USD
CY2012Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	46253000	USD
CY2012Q4	us-gaap	Marketable Securities MarketableSecurities	21429000	USD
CY2010	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	6521000	USD
CY2012	us-gaap	Affiliate Costs AffiliateCosts	18101000	USD
CY2011	us-gaap	Affiliate Costs AffiliateCosts	16266000	USD
CY2010	us-gaap	Affiliate Costs AffiliateCosts	14320000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Shares Outstanding SharesOutstanding	91249632	shares
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	292311000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	240445000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	332830000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	343715000	USD
CY2012Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
CY2010Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2011Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.25
CY2010	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	122041000	USD
CY2012	slg	Period From Cessation Of Major Construction Activity To Completion Of Construction Project Maximum PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum	P1Y
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1600000000	USD
CY2011Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	7800000000	USD
	slg	Multiemployer Plan Period Contribution Diversion From Health Plan To Pension Plan MultiemployerPlanPeriodContributionDiversionFromHealthPlanToPensionPlan	1950000	USD
CY2012	slg	Operating Leases Minimum Lease Term OperatingLeasesMinimumLeaseTerm	P1Y
CY2010Q1	slg	Amortization Period Of Deferred Gain Loss On Termination Of Interest Rate Hedge AmortizationPeriodOfDeferredGainLossOnTerminationOfInterestRateHedge	P10Y
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2012Q4	us-gaap	Land Land	2886099000	USD
CY2012Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	7389766000	USD
CY2012Q4	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1346748000	USD
CY2012Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	40340000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1393323000	USD
CY2012Q4	us-gaap	Assets Held For Sale At Carrying Value AssetsHeldForSaleAtCarryingValue	4901000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	189984000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	4615464000	USD
CY2012Q4	us-gaap	Line Of Credit LineOfCredit	70000000	USD
CY2012Q4	us-gaap	Senior Notes SeniorNotes	1734956000	USD
CY2012Q4	slg	Accrued Interest Payable And Other AccruedInterestPayableAndOther	73769000	USD
CY2012Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	159598000	USD
CY2012Q4	us-gaap	Deferred Revenue DeferredRevenue	321764000	USD
CY2012Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	37518000	USD
CY2012Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	20897000	USD
CY2012	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	1077976000	USD
CY2012	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	3529000	USD
CY2012	us-gaap	Tenant Reimbursements TenantReimbursements	167388000	USD
CY2012	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	48368000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	35932000	USD
CY2012	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	9389000	USD
CY2012	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	119155000	USD
CY2012	us-gaap	Other Income OtherIncome	35736000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	950000	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4667900000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	322858000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-29587000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1701092000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	298322000	USD
CY2012	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	210467000	USD
CY2012	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	37866000	USD
CY2012	slg	Interest Expense Net InterestExpenseNet	330569000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	19450000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	332028000	USD
CY2012	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	564000	USD
CY2012	slg	Transaction Related Costs TransactionRelatedCosts	5625000	USD
CY2012	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	82840000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	76418000	USD
CY2012	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	4940000	USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6978000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	105019000	USD
CY2012	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstate	35769000	USD
CY2012	slg	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Attributable To Parent DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTaxAttributableToParent	8799000	USD
CY2012	slg	Gain Loss On Sale Of Discontinued Operations GainLossOnSaleOfDiscontinuedOperations	6397000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	953000	USD
CY2012	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1174000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3657000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	13295000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-388000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	351539000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6907103000	USD
CY2012	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	99570000	USD
CY2012	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	200013000	USD
CY2012	slg	Reallocation Minority Interest In Operating Partnerships ReallocationMinorityInterestInOperatingPartnerships	61238000	USD
CY2012	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	-13428000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	28742000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	221965000	USD
CY2012	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1230167000	USD
CY2012	slg	Common Stock Issued During Period Value New Issues CommonStockIssuedDuringPeriodValueNewIssues	201279000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	13173000	USD
CY2012	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	25894000	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	98160000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	21946000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	4448774000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	2626639000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	7938087000	USD
CY2012Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Land RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand	259460000	USD
CY2012Q4	slg	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Of Building And Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements	838767000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	2886099000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	8776854000	USD
CY2012	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	3413000	USD
CY2012	slg	Proceeds From Equity Method Investment Dividends Or Distributions ProceedsFromEquityMethodInvestmentDividendsOrDistributions	-127876000	USD
CY2012	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	178485000	USD
CY2012	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	32413000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	215174000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	11662953000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	1393323000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	161581000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	91145000	USD
CY2012	us-gaap	Straight Line Rent StraightLineRent	66079000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	15229000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	13812000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10998000	USD
CY2012	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	1751480000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	353743000	USD
CY2012	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	544568000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	148148000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	70080000	USD
CY2012	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	1581554000	USD
CY2012	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	688065000	USD
CY2012	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	-466371000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1170393000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	112743000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	201279000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14150000	USD
CY2012	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	21946000	USD
CY2012	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	25894000	USD
CY2012	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	3296000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	121238000	USD
CY2012	slg	Proceeds From Participating Mortgage Loan ProceedsFromParticipatingMortgageLoan	5000000	USD
CY2012	slg	Deferred Loan Costs And Capitalized Lease Obligation DeferredLoanCostsAndCapitalizedLeaseObligation	49824000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	868442000	USD
CY2012	us-gaap	Interest Paid InterestPaid	320849000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	17000	USD
CY2012	slg	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Into Equity In Net Income CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonthsIntoEquityInNetIncome	4900000	USD
CY2012	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	28132000	USD
CY2012	slg	Deconsolidation Real Estate Investments DeconsolidationRealEstateInvestments	104107000	USD
CY2012	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	221965000	USD
CY2012	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	4901000	USD
CY2012	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	136000	USD
CY2012	us-gaap	Stock Issued1 StockIssued1	47550000	USD

Files In Submission

Name	View Source	Status
0001047469-13-001830-index-headers.html	Edgar Link	pending
0001047469-13-001830-index.html	Edgar Link	pending
0001047469-13-001830.txt	Edgar Link	pending
0001047469-13-001830-xbrl.zip	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
slg-20121231.xml	Edgar Link	completed
slg-20121231.xsd	Edgar Link	pending
slg-20121231_cal.xml	Edgar Link	unprocessable
slg-20121231_def.xml	Edgar Link	unprocessable
slg-20121231_lab.xml	Edgar Link	unprocessable
slg-20121231_pre.xml	Edgar Link	unprocessable

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$SLG
SL Green Realty Corp Stock $slg

2012 Q4 Form 10-K Financial Statement

#000104746913001830 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG SL Green Realty Corp Stock $slg

2012 Q4 Form 10-K Financial Statement

#000104746913001830 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL Green Realty Corp Stock $slg