$SLG
SL Green Realty Corp Stock $slg

$slg Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-Q Financial Statement

#000110465912075409 Filed on November 07, 2012

Income Statement

Concept	2012 Q4	2012 Q3	2011 Q3
Revenue	$346.6M	$357.0M	$306.6M
YoY Change	5.39%	16.43%	-3.94%
Cost Of Revenue	$134.6M	$144.5M	$122.5M
YoY Change	12.92%	17.96%	20.45%
Gross Profit	$212.0M	$212.5M	$184.2M
YoY Change	11.87%	15.36%	-15.27%
Gross Profit Margin	61.17%	59.52%	60.07%
Selling, General & Admin	$22.60M	$20.55M	$18.90M
YoY Change	10.24%	8.74%	-12.9%
% of Gross Profit	10.66%	9.67%	10.26%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$101.5M	$88.00M	$76.20M
YoY Change	27.35%	15.49%	26.79%
% of Gross Profit	47.88%	41.41%	41.37%
Operating Expenses	$114.8M	$20.55M	$18.90M
YoY Change	28.56%	8.74%	-76.49%
Operating Profit	$97.20M	$191.9M	$165.3M
YoY Change	-2.99%	16.12%	20.66%
Interest Expense	-$72.50M	$86.05M	$75.11M
YoY Change	-10.16%	14.55%	-251.13%
% of Operating Profit	-74.59%	44.83%	45.44%
Other Income/Expense, Net			$0.00
YoY Change
Pretax Income	$17.70M	$18.59M	$14.14M
YoY Change	29.2%	31.52%	-83.73%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income	0.0%	0.0%	0.0%
Net Earnings	$27.36M	$25.66M	$14.62M
YoY Change	164.35%	75.44%	-87.71%
Net Earnings / Revenue	7.89%	7.19%	4.77%
Basic Earnings Per Share	$0.22	$0.09	$0.08
Diluted Earnings Per Share	$0.22	$0.09	$0.08
COMMON SHARES
Basic Shares Outstanding	90.37M shares	90.24M shares	85.70M shares
Diluted Shares Outstanding		93.89M shares	88.08M shares

Balance Sheet

Concept	2012 Q4	2012 Q3	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$211.4M	$183.9M	$395.0M
YoY Change	29.29%	-53.44%	45.76%
Cash & Equivalents	$190.0M	$162.4M	$394.5M
Short-Term Investments	$21.43M	$21.55M
Other Short-Term Assets
YoY Change
Inventory	$5.000M	$92.00M
Prepaid Expenses
Receivables	$404.0M	$366.0M	$300.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$599.0M	$620.0M	$695.0M
YoY Change	31.36%	-10.79%	39.56%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.27B	$10.38B	$9.548B
YoY Change	2.59%	8.71%	23.55%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$1.032B	$1.021B	$1.873B
YoY Change	15.47%	-45.5%	6.54%
Other Assets	$397.0M	$396.0M	$293.0M
YoY Change	6.15%	35.15%	-5.48%
Total Long-Term Assets	$13.79B	$13.66B	$12.47B
YoY Change	5.83%	9.6%	23.57%
TOTAL ASSETS
Total Short-Term Assets	$599.0M	$620.0M	$695.0M
Total Long-Term Assets	$13.79B	$13.66B	$12.47B
Total Assets	$14.39B	$14.28B	$13.16B
YoY Change	6.69%	8.52%	24.32%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$160.0M	$147.0M	$146.0M
YoY Change	12.68%	0.68%	0.69%
Accrued Expenses	$81.00M	$101.0M	$126.0M
YoY Change	-35.71%	-19.84%	500.0%
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	$344.0M	$350.0M
YoY Change	-4.16%	-1.71%	48.31%
LONG-TERM LIABILITIES
Long-Term Debt	$6.558B	$6.343B	$5.904B
YoY Change	8.34%	7.44%	27.1%
Other Long-Term Liabilities	$313.0M	$424.0M	$381.0M
YoY Change	-25.3%	11.29%	18.69%
Total Long-Term Liabilities	$6.871B	$6.767B	$6.285B
YoY Change	6.17%	7.67%	26.56%
TOTAL LIABILITIES
Total Short-Term Liabilities	$346.0M	$344.0M	$350.0M
Total Long-Term Liabilities	$6.871B	$6.767B	$6.285B
Total Liabilities	$7.217B	$7.110B	$7.134B
YoY Change	5.61%	-0.33%	23.02%
SHAREHOLDERS EQUITY
Retained Earnings	$1.556B	$1.728B
YoY Change	-8.71%
Common Stock	$913.0K	$940.0K
YoY Change	2.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$0.00	$319.9M
YoY Change	-100.0%
Treasury Stock Shares	3.646M shares	3.607M shares
Shareholders Equity	$6.420B	$6.372B	$6.029B
YoY Change
Total Liabilities & Shareholders Equity	$14.39B	$14.28B	$13.16B
YoY Change	6.69%	8.52%	24.32%

Cashflow Statement

Concept	2012 Q4	2012 Q3	2011 Q3
OPERATING ACTIVITIES
Net Income	$27.36M	$25.66M	$14.62M
YoY Change	164.35%	75.44%	-87.71%
Depreciation, Depletion And Amortization	$101.5M	$88.00M	$76.20M
YoY Change	27.35%	15.49%	26.79%
Cash From Operating Activities	$76.60M	$72.30M	$60.90M
YoY Change	1.86%	18.72%	-39.88%
INVESTING ACTIVITIES
Capital Expenditures	-$180.0M	-$187.6M	-$54.10M
YoY Change	10.84%	246.77%	-73.55%
Acquisitions
YoY Change
Other Investing Activities	-$160.0M	-$77.70M	-$382.8M
YoY Change	111.64%	-79.7%	-388.69%
Cash From Investing Activities	-$340.0M	-$265.4M	-$436.8M
YoY Change	42.8%	-39.24%	507.51%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	291.0M	98.70M	380.2M
YoY Change	-411.56%	-74.04%	-486.78%
NET CHANGE
Cash From Operating Activities	76.60M	72.30M	60.90M
Cash From Investing Activities	-340.0M	-265.4M	-436.8M
Cash From Financing Activities	291.0M	98.70M	380.2M
Net Change In Cash	27.60M	-94.40M	4.300M
YoY Change	-110.77%	-2295.35%	-106.24%
FREE CASH FLOW
Cash From Operating Activities	$76.60M	$72.30M	$60.90M
Capital Expenditures	-$180.0M	-$187.6M	-$54.10M
Free Cash Flow	$256.6M	$259.9M	$115.0M
YoY Change	8.0%	126.0%	-62.39%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Registrant Name EntityRegistrantName	SL GREEN REALTY CORP
	dei	Entity Central Index Key EntityCentralIndexKey	0001040971
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2012-09-30
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2012Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	90366509	shares
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	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	Equity Method Investments EquityMethodInvestments	893933000	USD
CY2011Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	210786000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	737900000	USD
CY2011Q4	us-gaap	Assets Assets	13483852000	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
CY2012Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	195030000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	892000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4236959000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	308708000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28445000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1704506000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	5975547000	USD
CY2011Q4	us-gaap	Other Minority Interests OtherMinorityInterests	477762000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6453309000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13483852000	USD
CY2012Q3	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	11719628000	USD
CY2012Q3	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	10380304000	USD
CY2012Q3	us-gaap	Assets Assets	14284939000	USD
CY2012Q3	us-gaap	Liabilities Liabilities	7110271000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	6371912000	USD
CY2012Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6860025000	USD
CY2012Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14284939000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	16772000	USD
CY2011Q4	slg	Allowance For Deferred Rents Receivable AllowanceForDeferredRentsReceivable	29156000	USD
CY2011Q4	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	24996000	USD
CY2011Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	50175000	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	89210000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	89210000	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	3427000	shares
CY2012Q3	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	21575000	USD
CY2012Q3	slg	Allowance For Deferred Rents Receivable AllowanceForDeferredRentsReceivable	30076000	USD
CY2012Q3	slg	Discount Of Structured Finance Investments DiscountOfStructuredFinanceInvestments	13207000	USD
CY2012Q3	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	7000000	USD
CY2012Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	160000000	shares
CY2012Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	93970000	shares
CY2012Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	93970000	shares
CY2012Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	3607000	shares
CY2011Q3	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	242938000	USD
	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	708593000	USD
CY2011Q3	us-gaap	Tenant Reimbursements TenantReimbursements	39176000	USD
	us-gaap	Tenant Reimbursements TenantReimbursements	104446000	USD
CY2011Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	18433000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	98256000	USD
CY2011Q3	us-gaap	Other Income OtherIncome	6076000	USD
	us-gaap	Other Income OtherIncome	23256000	USD
CY2011Q3	us-gaap	Revenues Revenues	306623000	USD
	us-gaap	Revenues Revenues	934551000	USD
CY2011Q3	us-gaap	Costs And Expenses CostsAndExpenses	69093000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	191792000	USD
CY2011Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	44915000	USD
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	128957000	USD
CY2011Q3	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	8463000	USD
	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	24110000	USD
CY2011Q3	slg	Interest Expense Net InterestExpenseNet	74603000	USD
	slg	Interest Expense Net InterestExpenseNet	207042000	USD
CY2011Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2986000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	9469000	USD
CY2011Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	73358000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	202394000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-1870000	USD
CY2011Q3	slg	Transaction Related Costs TransactionRelatedCosts	169000	USD
	slg	Transaction Related Costs TransactionRelatedCosts	3820000	USD
CY2011Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	18900000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	61375000	USD
CY2011Q3	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	292487000	USD
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	827089000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	14136000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	107462000	USD
CY2011Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2728000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7663000	USD
CY2011Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	3032000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1398000	USD
CY2012Q3	us-gaap	Affiliate Costs AffiliateCosts	4668000	USD
	us-gaap	Affiliate Costs AffiliateCosts	12856000	USD
CY2011Q3	us-gaap	Affiliate Costs AffiliateCosts	4335000	USD
	us-gaap	Affiliate Costs AffiliateCosts	10948000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4389000	USD
CY2011Q3	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3070000	USD
	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	319000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1528000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2094000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2940000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1976000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	13548000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	657591000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	11751000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	635254000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14779000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	158196000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	27703000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	181011000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-927000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1232000	USD
	slg	Profit Loss Less Minority Interest In Net Income Loss Operating Partnerships ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships	165824000	USD
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	3032000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	212558000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	9787000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.75
	slg	Proceeds From Noncontrolling Interests In Other Partnerships ProceedsFromNoncontrollingInterestsInOtherPartnerships	19181000	USD
	slg	Purchase Price Fair Value Adjustments PurchasePriceFairValueAdjustments	489889000	USD
	us-gaap	Gain Loss On Sale Of Debt Investments GainLossOnSaleOfDebtInvestments	19840000	USD
	us-gaap	Straight Line Rent StraightLineRent	64600000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3158000	USD
	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-1757000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3130000	USD
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-524000	USD
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	25483000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	11994000	USD
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	12692000	USD
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	12010000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	237696000	USD
	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	331972000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	111485000	USD
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-39886000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	95611000	USD
	slg	Proceeds From Equity Method Investment Dividends Or Distributions ProceedsFromEquityMethodInvestmentDividendsOrDistributions	-107753000	USD
	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	160548000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	16374000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	-254264000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-501519000	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	740000000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	754358000	USD
	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	1401068000	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	1393144000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	8278000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4313000	USD
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	143474000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	24171000	USD
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	572000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	47684000	USD
	slg	Deferred Loan Costs And Capitalized Lease Obligation DeferredLoanCostsAndCapitalizedLeaseObligation	-3347000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	325498000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	587391000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	61675000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-829176000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	265956000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	162363000	USD
CY2011Q3	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	999000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	332830000	USD
CY2011Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	394505000	USD
CY2012Q3	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	29537460
CY2012Q3	slg	Real Estate Weighted Average Occupancy RealEstateWeightedAverageOccupancy	0.914	pure
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	388000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	1555000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	1555000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	1593000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	1707000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	42351000	USD
CY2011Q4	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	5800000	USD
CY2011Q4	slg	Equity Method Investment Other Than Temporary Impairment Number EquityMethodInvestmentOtherThanTemporaryImpairmentNumber	1	investment
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	7500000	USD
CY2011Q3	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	3400000	USD
	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	700000	USD
	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	3300000	USD
CY2012Q3	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	2600000	USD
	slg	Rental Revenue Increase Decrease Acquired Lease Amortization RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization	15800000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	673495000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	744782000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	193442000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	252152000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	480053000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	492630000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	622029000	USD
CY2012Q3	slg	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	668999000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	290893000	USD
CY2012Q3	slg	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	346154000	USD
CY2011Q4	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	331136000	USD
CY2012Q3	slg	Finite Lived Intangible Liabilities Net FiniteLivedIntangibleLiabilitiesNet	322845000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	431000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1648000	USD
CY2012Q3	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	253137000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	6300000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2500000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2436000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4400000	USD
	slg	Minimum Percentage Of Taxable Income To Be Distributed As Dividend To Maintain Qualification As Reit MinimumPercentageOfTaxableIncomeToBeDistributedAsDividendToMaintainQualificationAsREIT	0.90	pure
	us-gaap	Income Taxes Paid IncomeTaxesPaid	100000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	200000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	200000	USD
CY2011Q3	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	1950000	USD
	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	2142000	USD
	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	10685000	USD
CY2012Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	223000	USD
	slg	Disposal Group Including Discontinued Operation Tenant Reimbursements DisposalGroupIncludingDiscontinuedOperationTenantReimbursements	873000	USD
CY2011Q3	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	834000	USD
	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	60000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1950000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1766000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	11618000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	3000	USD
	slg	Disposal Group Including Discontinued Operation Real Estate Tax Expense DisposalGroupIncludingDiscontinuedOperationRealEstateTaxExpense	1034000	USD
CY2011Q3	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	825000	USD
	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	1125000	USD
	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	3429000	USD
CY2011Q3	slg	Disposal Group Including Discontinued Operation Amortization Of Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfFinancingCosts	6000	USD
	slg	Disposal Group Including Discontinued Operation Amortization Of Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfFinancingCosts	166000	USD
	slg	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	676000	USD
	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	1621000	USD
	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	6953000	USD
	slg	Purchase Price Fair Value Adjustment Gross PurchasePriceFairValueAdjustmentGross	489889000	USD
CY2012Q3	us-gaap	Due From Joint Ventures DueFromJointVentures	514000	USD
CY2011Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	477000	USD
CY2012Q3	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	7280000	USD
CY2011Q4	us-gaap	Due From Other Related Parties DueFromOtherRelatedParties	3524000	USD
	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	-133000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	49149000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	8410000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	33641000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	33641000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	33641000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	33745000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	630503000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	773581000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	31982000	USD
CY2012Q3	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	17167000	USD
CY2012Q3	slg	Operating Leases Minimum Lease Term OperatingLeasesMinimumLeaseTerm	P1Y
	us-gaap	Deferred Compensation Arrangement With Individual Fair Value Of Shares Issued DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued	631000	USD
	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	40542000	USD
	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	17467000	USD
	slg	Derivative Instruments Fair Value Adjustment DerivativeInstrumentsFairValueAdjustment	375000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10056000	USD
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	44893000	USD
	us-gaap	Deferred Compensation Arrangement With Individual Fair Value Of Shares Issued DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued	621000	USD
	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	20222000	USD
	us-gaap	Partners Capital Account Redemptions PartnersCapitalAccountRedemptions	865000	USD
	slg	Derivative Instruments Fair Value Adjustment DerivativeInstrumentsFairValueAdjustment	1674000	USD
	us-gaap	Transfer Of Investments TransferOfInvestments	286571000	USD
CY2012Q3	us-gaap	Secured Debt SecuredDebt	4849233000	USD
	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	30000000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8686000	USD
	us-gaap	Loans Assumed1 LoansAssumed1	663767000	USD
	slg	Operating Partnership Noncontrolling Interest Fair Value Adjustment OperatingPartnershipNoncontrollingInterestFairValueAdjustment	1168000	USD
	slg	Acquisition Liabilities Incurred But Not Yet Paid AcquisitionLiabilitiesIncurredButNotYetPaid	43000000	USD
	slg	Consolidation Of Real Estate Investments ConsolidationOfRealEstateInvestments	557314000	USD
	slg	Mortgage Loans On Real Estate Period Increase MortgageLoansOnRealEstatePeriodIncrease	374000000	USD
	slg	Mortgage Loans On Real Estate Period Decrease MortgageLoansOnRealEstatePeriodDecrease	288300000	USD
	slg	Mortgage Loans On Real Estate Period Increase MortgageLoansOnRealEstatePeriodIncrease	516100000	USD
	slg	Mortgage Loans On Real Estate Period Decrease MortgageLoansOnRealEstatePeriodDecrease	582800000	USD
	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	-376000	USD
CY2010Q4	us-gaap	Allowance For Loan And Lease Losses Real Estate AllowanceForLoanAndLeaseLossesRealEstate	61361000	USD
CY2011	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10875000	USD
CY2011	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4370000	USD
	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2011	slg	Financing Receivable Portfolio Segments Number FinancingReceivablePortfolioSegmentsNumber	1	segment
CY2012Q3	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	120100000	USD
CY2011Q4	slg	Financing Receivable Recorded In Other Assets FinancingReceivableRecordedInOtherAssets	108700000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	102600000	USD
CY2011Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	17300000	USD
CY2011	slg	Financing Receivable Number90 Days Past Due And Still Accruing FinancingReceivableNumber90DaysPastDueAndStillAccruing	2	receivable
CY2012Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	40304000	USD
CY2012Q3	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	-298000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	63391000	USD
	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	3480000	USD
CY2011Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	174790000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	214310000	USD
CY2011Q3	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	1181000	USD
	slg	Impaired Financing Receivable Investment Income ImpairedFinancingReceivableInvestmentIncome	7542000	USD
	slg	Reporting Segments Number ReportingSegmentsNumber	2	segment
CY2011Q3	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	11341000	USD
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	115896000	USD
CY2012Q3	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	33214000	USD
	slg	Income Loss From Continuing Operations Before Realized Gain Loss On Disposal Of Equity Method Investment IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment	163484000	USD
CY2012Q3	slg	Interest Cost Assumptions Leverage Rate InterestCostAssumptionsLeverageRate	1.00	pure
CY2012Q3	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	21900000	USD
CY2011Q3	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	19100000	USD
	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	66000000	USD
	slg	Selling General And Administrative Expense And Transaction Related Costs SellingGeneralAndAdministrativeExpenseAndTransactionRelatedCosts	65200000	USD
	slg	Depreciable Real Estate Reserves DepreciableRealEstateReserves	5789000	USD
CY2011Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-67000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	904000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	15372000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	608817000	USD
CY2011Q4	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	161900000	USD
CY2012Q3	slg	Variable Interest Entity Not Primary Beneficiary Investment VariableInterestEntityNotPrimaryBeneficiaryInvestment	179400000	USD
	slg	Variable Interest Entity Not Primary Beneficiary Number VariableInterestEntityNotPrimaryBeneficiaryNumber	3	entity
CY2011Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1116000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	175471000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	28407000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	145000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	7249000	USD
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92485000	shares
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	6627000	USD
	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	6792000	USD
CY2012Q3	slg	Secured Debt Bearing Fixed Interest Amount SecuredDebtBearingFixedInterestAmount	3654167000	USD
CY2012Q3	slg	Secured Debt Bearing Variable Interest Amount SecuredDebtBearingVariableInterestAmount	1257858000	USD
CY2012Q3	slg	Secured Debt And Other Loans Payable SecuredDebtAndOtherLoansPayable	4912025000	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
CY2012Q3	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	7600000000	USD
CY2011Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	7400000000	USD
CY2012Q3	slg	Accumulated Other Comprehensive Income Loss Gain Loss On Settlement Of Derivatives AccumulatedOtherComprehensiveIncomeLossGainLossOnSettlementOfDerivatives	-17300000	USD
CY2012Q3	slg	Accumulated Other Comprehensive Income Loss Derivative Contracts Held And Entitys Share Of Joint Venture Aoci AccumulatedOtherComprehensiveIncomeLossDerivativeContractsHeldAndEntitysShareOfJointVentureAOCI	-18300000	USD
CY2010Q1	slg	Gain Loss On Termination Of Derivative GainLossOnTerminationOfDerivative	-19500000	USD
CY2010Q1	slg	Amortization Period Of Deferred Gain Loss On Termination Of Interest Rate Hedge AmortizationPeriodOfDeferredGainLossOnTerminationOfInterestRateHedge	P10Y
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-35500000	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
CY2012Q3	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1900000	USD
CY2012Q3	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-3433000	USD
CY2011Q3	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-7188000	USD
CY2012Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-3249000	USD
CY2011Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-3179000	USD
CY2012Q3	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-666000	USD
CY2011Q3	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-493000	USD
CY2011Q3	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-1000	USD
	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-10356000	USD
	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-13260000	USD
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-9665000	USD
	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-9394000	USD
	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-997000	USD
	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-168000	USD
	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-2000	USD
	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-17000	USD
CY2012Q3	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	1835000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	12885000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal First Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalFirstFullFiscalYear	567087000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Second Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalSecondFullFiscalYear	297368000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Third Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalThirdFullFiscalYear	285707000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal Fourth Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalFourthFullFiscalYear	1046976000	USD
CY2012Q3	us-gaap	Long Term Debt LongTermDebt	-6388277000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	86214000	USD
CY2012Q3	us-gaap	Interest Income Operating InterestIncomeOperating	386000	USD
CY2012Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-85828000	USD
CY2012Q3	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	3360000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	75114000	USD
CY2011Q3	us-gaap	Interest Income Operating InterestIncomeOperating	511000	USD
CY2011Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-74603000	USD
CY2011Q3	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1412000	USD
	us-gaap	Interest Expense InterestExpense	249489000	USD
	us-gaap	Interest Income Operating InterestIncomeOperating	1197000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-248292000	USD
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	8892000	USD
	us-gaap	Interest Expense InterestExpense	208577000	USD
	us-gaap	Interest Income Operating InterestIncomeOperating	1535000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-207042000	USD
	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	3629000	USD
CY2012Q3	slg	Total Shares Authorized TotalSharesAuthorized	260000000	shares
CY2012Q3	slg	Total Par Or Stated Value Per Share TotalParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	75000000	shares
CY2012Q3	slg	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	25000000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	93891000	shares
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	23004000	USD
CY2012Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	900000	USD
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2900000	USD
CY2011Q3	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	900000	USD
	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2800000	USD
CY2012Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7915000	USD
CY2012Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	567000	USD
CY2011Q3	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	170000	USD
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	4876000	USD
	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	13946000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	8299000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	140904000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	628369000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	4665000	USD
CY2012Q3	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3320000	shares
CY2011Q3	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	1912000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	3188000	shares
	slg	Incremental Common Shares Attributable To Redemption Of Units To Common Shares IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares	1876000	shares
CY2012Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	330000	shares
CY2011Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	473000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	368000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	507000	shares
	us-gaap	Transfer Of Investments TransferOfInvestments	25362000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	46085000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	16488000	USD
CY2012Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	548000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	613000	shares
CY2011Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	667000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	657000	shares
CY2012Q3	us-gaap	Gain Loss On Interest Rate Cash Flow Hedge Ineffectiveness GainLossOnInterestRateCashFlowHedgeIneffectiveness	-1000	USD
CY2012Q3	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	65	property
	slg	Number Of Shares On Redemption Of One Unit Of Partnership Interest NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest	1	shares
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	22634000	USD
	us-gaap	Profit Loss ProfitLoss	659567000	USD
CY2012Q3	slg	Mortgage Loans On Real Estate Senior Debt On Investment MortgageLoansOnRealEstateSeniorDebtOnInvestment	2881072000	USD
CY2011Q3	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	170000	USD
	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	13946000	USD
CY2011Q3	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	1694000	USD
	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	8564000	USD
CY2012Q3	slg	Preferred Units Distributions PreferredUnitsDistributions	571000	USD
CY2012Q3	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	146339000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	113620000	USD
CY2012Q3	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	274125000	USD
CY2011Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	238394000	USD
CY2012Q3	slg	Deferred Costs Gross DeferredCostsGross	420464000	USD
CY2011Q4	slg	Deferred Costs Gross DeferredCostsGross	352014000	USD
CY2012Q3	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	167327000	USD
CY2011Q4	slg	Accumulated Amortization Of Deferred Costs AccumulatedAmortizationOfDeferredCosts	141228000	USD
	slg	Preferred Units Distributions PreferredUnitsDistributions	1533000	USD
CY2012Q3	us-gaap	Longterm Debt Percentage Bearing Fixed Interest Amount LongtermDebtPercentageBearingFixedInterestAmount	5000000000	USD
CY2012Q3	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	1400000000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <p style="MARGIN: 0in 0in 0pt"> </p> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Use of Estimates</font></b></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" 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> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p></td></tr></table>
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Basic Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerBasicShare	0.03
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	190000	USD
CY2012Q3	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-292000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <p style="MARGIN: 0in 0in 0pt"> </p> <p style="MARGIN: 0in 0in 0pt"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2">Concentrations of Credit Risk</font></b></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></p> <p style="MARGIN: 0in 0in 0pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" 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 primarily 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 and New Jersey.  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 cash rent at September 30, 2012. Approximately 10%, 5%, 6%, 5% and 6% of our annualized cash rent, including our share of joint venture annualized cash rent, was attributable to 1515 Broadway, 420 Lexington Avenue, 1185 Avenue of the Americas, 485 Lexington Avenue and One Madison Avenue, respectively, for the three months ended September 30, 2012.  In addition, three debt and preferred equity investments accounted for more than 10.0% of the income earned on debt and preferred equity investments during the three months ended September 30, 2012.</font></p> <p style="MARGIN: 0in 0in 0pt; TEXT-ALIGN: center" align="center"><b><font style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman" size="2"> </font></b></p></td></tr></table>
CY2012Q3	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	1200000	USD
CY2011Q3	slg	Interest Expense Increase Decrease Assumed Above Market Rate Mortgage Amortization InterestExpenseIncreaseDecreaseAssumedAboveMarketRateMortgageAmortization	300000	USD
CY2012Q3	slg	Future Amortization Of Debt And Long Term Debt Maturities Repayments Of Principal After Fifth Full Fiscal Year FutureAmortizationOfDebtAndLongTermDebtMaturitiesRepaymentsOfPrincipalAfterFifthFullFiscalYear	4178254000	USD
CY2012Q3	slg	Disposal Group Including Discontinued Operation Transaction Related Costs DisposalGroupIncludingDiscontinuedOperationTransactionRelatedCosts	65000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	14624000	USD
	us-gaap	Net Income Loss NetIncomeLoss	637057000	USD
CY2011Q3	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7545000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7079000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	614423000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	2045000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	82769000	USD
CY2011Q3	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	977000	USD
	slg	Purchase Price Fair Value Adjustments Attributable To Parent PurchasePriceFairValueAdjustmentsAttributableToParent	479062000	USD
CY2011Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstate	2966000	USD
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstate	2965000	USD
CY2011Q3	slg	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Attributable To Parent DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTaxAttributableToParent	1091000	USD
	slg	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Attributable To Parent DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTaxAttributableToParent	4560000	USD
	slg	Gain Loss On Sale Of Discontinued Operations GainLossOnSaleOfDiscontinuedOperations	45067000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.04
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	6.77
CY2011Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Basic Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerBasicShare	0.03
CY2012Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-825000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	493000	USD
	slg	Other Comprehensive Income Of Joint Venture Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeOfJointVentureUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1128000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-597000	USD
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	117022000	USD
	slg	Reallocation Minority Interest In Operating Partnerships ReallocationMinorityInterestInOperatingPartnerships	44893000	USD
	slg	Deferred Compensation Plan And Stock Award Net DeferredCompensationPlanAndStockAwardNet	-10566000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20667000	USD
	slg	Common Stock Issued During Period Value New Issues CommonStockIssuedDuringPeriodValueNewIssues	201299000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.06
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	12893000	USD
	slg	Consolidation Of Joint Venture Interest ConsolidationOfJointVentureInterest	19181000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	15622000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	67491000	USD
	slg	Transfer To Net Assets Held For Sale TransferToNetAssetsHeldForSale	86339000	USD
	slg	Transfer To Liabilities Related To Net Assets Held For Sale TransferToLiabilitiesRelatedToNetAssetsHeldForSale	62792000	USD
	slg	Gain Loss On Sale Of Discontinued Operations Net Of Noncontrolling Interest Per Basic Share GainLossOnSaleOfDiscontinuedOperationsNetOfNoncontrollingInterestPerBasicShare	0.54
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2012Q3	us-gaap	Shares Outstanding SharesOutstanding	90363063	shares
CY2011Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	985942000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.40
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.04
CY2012Q3	us-gaap	Temporary Equity Redemption Value TemporaryEquityRedemptionValue	31698000	USD
	slg	Repayment Of Financing Receivables RepaymentOfFinancingReceivables	28195000	USD
	slg	Comprehensive Income Change In Aoci Net Of Tax ComprehensiveIncomeChangeInAOCINetOfTax	-836000	USD
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	6.73
CY2011Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	0.03
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	0.04
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.05
	slg	Gain Loss On Sale Of Discontinued Operations Per Diluted Share GainLossOnSaleOfDiscontinuedOperationsPerDilutedShare	0.54
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.36
CY2011Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.25
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.75
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85696000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83001000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	88081000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85384000	shares
	us-gaap	Revenues Revenues	1049638000	USD
CY2012Q3	us-gaap	Revenues Revenues	361441000	USD
CY2012Q3	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	342122000	USD
	slg	Total Costs And Expenses Including Nonoperating Income Expense TotalCostsAndExpensesIncludingNonoperatingIncomeExpense	975168000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	74470000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	19319000	USD
	us-gaap	Net Income Loss NetIncomeLoss	169042000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	136028000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7732000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	25657000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.53
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.52
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
	slg	Disposal Group Including Discontinued Operation Transaction Related Costs DisposalGroupIncludingDiscontinuedOperationTransactionRelatedCosts	65000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	222245000	USD
CY2012Q3	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1071641000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	88929000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90241000	shares
CY2012Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	12153000	USD
CY2012Q3	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	567000	USD
	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	4876000	USD
	us-gaap	Stock Issued1 StockIssued1	14997000	USD
CY2012Q3	slg	Disposal Group Including Discontinued Operation Lease Revenue DisposalGroupIncludingDiscontinuedOperationLeaseRevenue	1626000	USD
CY2012Q3	slg	Disposal Group Including Discontinued Operation Other Income DisposalGroupIncludingDiscontinuedOperationOtherIncome	-376000	USD
CY2012Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	1250000	USD
CY2012Q3	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	435000	USD
CY2012Q3	slg	Disposal Group Including Discontinued Operation Interest Expense Net DisposalGroupIncludingDiscontinuedOperationInterestExpenseNet	527000	USD
CY2012Q3	slg	Disposal Group Including Discontinued Operation Total Costs And Expenses DisposalGroupIncludingDiscontinuedOperationTotalCostsAndExpenses	1027000	USD
CY2012Q3	us-gaap	Mortgage Loans On Real Estate Interest Rate MortgageLoansOnRealEstateInterestRate	0.093	pure
CY2012Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Land Land	2937866000	USD
CY2012Q3	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	7438364000	USD
CY2012Q3	slg	Building Leasehold Improvements Gross BuildingLeaseholdImprovementsGross	1331190000	USD
CY2012Q3	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	12208000	USD
CY2012Q3	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	35315000	USD
CY2012Q3	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	53595000	USD
CY2012Q3	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	1339324000	USD
	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	157662000	USD
CY2012Q3	us-gaap	Assets Held For Sale At Carrying Value AssetsHeldForSaleAtCarryingValue	91574000	USD
CY2012Q3	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	-4807000	USD
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	11987000	USD
CY2012Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	143058000	USD
CY2012Q3	us-gaap	Marketable Securities MarketableSecurities	21549000	USD
CY2012Q3	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	8874000	USD
CY2012Q3	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	2237000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	226168000	USD
CY2012Q3	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	330349000	USD
CY2012Q3	us-gaap	Equity Method Investments EquityMethodInvestments	1020790000	USD
CY2012Q3	us-gaap	Other Assets OtherAssets	774859000	USD
CY2012Q3	us-gaap	Line Of Credit LineOfCredit	200000000	USD
CY2012Q3	us-gaap	Senior Notes SeniorNotes	1176252000	USD
CY2012Q3	slg	Accrued Interest Payable And Other AccruedInterestPayableAndOther	100528000	USD
CY2012Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	147452000	USD
CY2012Q3	us-gaap	Deferred Revenue DeferredRevenue	360752000	USD
CY2012Q3	us-gaap	Capital Lease Obligations CapitalLeaseObligations	17167000	USD
CY2012Q3	us-gaap	Deferred Rent Credit DeferredRentCredit	18833000	USD
CY2012Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	29154000	USD
CY2012Q3	us-gaap	Security Deposit Liability SecurityDepositLiability	47698000	USD
CY2012Q3	us-gaap	Liabilities Of Assets Held For Sale LiabilitiesOfAssetsHeldForSale	63202000	USD
CY2012Q3	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	100000000	USD
CY2012Q3	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	265093000	USD
CY2012Q3	us-gaap	Common Stock Value CommonStockValue	940000	USD
CY2012Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4589423000	USD
CY2012Q3	us-gaap	Treasury Stock Value TreasuryStockValue	319905000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-29281000	USD
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1728150000	USD
CY2012Q3	us-gaap	Other Minority Interests OtherMinorityInterests	488113000	USD
CY2012Q3	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	281496000	USD
	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	810001000	USD
CY2012Q3	us-gaap	Tenant Reimbursements TenantReimbursements	42804000	USD
	us-gaap	Tenant Reimbursements TenantReimbursements	126050000	USD
CY2012Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	27869000	USD
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	87655000	USD
CY2012Q3	us-gaap	Other Income OtherIncome	9272000	USD
	us-gaap	Other Income OtherIncome	25932000	USD
CY2012Q3	us-gaap	Costs And Expenses CostsAndExpenses	83980000	USD
	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	26570000	USD
CY2012Q3	slg	Interest Expense Net InterestExpenseNet	85828000	USD
	slg	Interest Expense Net InterestExpenseNet	248292000	USD
CY2012Q3	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4493000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11626000	USD
CY2012Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	83429000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	238324000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	564000	USD
CY2012Q3	slg	Transaction Related Costs TransactionRelatedCosts	1372000	USD
	slg	Transaction Related Costs TransactionRelatedCosts	4493000	USD
CY2012Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	20551000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	61469000	USD
CY2012Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11658000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	80988000	USD
	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	2237000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	28630000	USD
	us-gaap	Profit Loss ProfitLoss	182243000	USD
	slg	Distributions To Noncontrolling Interests Other Partnerships DistributionsToNoncontrollingInterestsOtherPartnerships	15622000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	117919000	USD
CY2012Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstate	-4636000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	11197000	USD
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstate	11572000	USD
CY2012Q3	slg	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Attributable To Parent DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTaxAttributableToParent	215000	USD
	slg	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Attributable To Parent DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTaxAttributableToParent	139000	USD
	slg	Gain Loss On Sale Of Discontinued Operations GainLossOnSaleOfDiscontinuedOperations	6398000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.14
CY2012Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Basic Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerBasicShare	-0.05
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.33
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Basic Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerBasicShare	0.13
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.14
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.32
CY2012Q3	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	-0.05
	slg	Gain Loss On Sale Of Unconsolidated Joint Ventures Or Real Estate Per Diluted Share GainLossOnSaleOfUnconsolidatedJointVenturesOrRealEstatePerDilutedShare	0.13
CY2012Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.25
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	249950000	USD
	us-gaap	Straight Line Rent StraightLineRent	50910000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1718000	USD
	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	12557000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	84182000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	8500000	USD
	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	3792000	USD
	us-gaap	Increase Decrease In Deferred Leasing Fees IncreaseDecreaseInDeferredLeasingFees	37885000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	44915000	USD
	slg	Increase Decrease In Accrued Liabilities And Other IncreaseDecreaseInAccruedLiabilitiesAndOther	11309000	USD
	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	12187000	USD
	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	405318000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	107425000	USD
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	68692000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	159524000	USD
	slg	Proceeds From Equity Method Investment Dividends Or Distributions ProceedsFromEquityMethodInvestmentDividendsOrDistributions	-48510000	USD
	us-gaap	Proceeds From Real Estate And Real Estate Joint Ventures ProceedsFromRealEstateAndRealEstateJointVentures	70367000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	28911000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	-178183000	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1113500000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	484518000	USD
	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	813339000	USD
	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	1065793000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	112447000	USD
	slg	Distribution To Noncontrolling Interest Operating Partnership DistributionToNoncontrollingInterestOperatingPartnership	2385000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	91272000	USD
	slg	Deferred Loan Costs And Capitalized Lease Obligation DeferredLoanCostsAndCapitalizedLeaseObligation	33830000	USD

Files In Submission

Name	View Source	Status
0001104659-12-075409-index-headers.html	Edgar Link	pending
0001104659-12-075409-index.html	Edgar Link	pending
0001104659-12-075409.txt	Edgar Link	pending
0001104659-12-075409-xbrl.zip	Edgar Link	pending
a12-19850_110q.htm	Edgar Link	pending
a12-19850_1ex31d1.htm	Edgar Link	pending
a12-19850_1ex31d2.htm	Edgar Link	pending
a12-19850_1ex32d1.htm	Edgar Link	pending
a12-19850_1ex32d2.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
slg-20120930.xml	Edgar Link	completed
slg-20120930.xsd	Edgar Link	pending
slg-20120930_cal.xml	Edgar Link	unprocessable
slg-20120930_def.xml	Edgar Link	unprocessable
slg-20120930_lab.xml	Edgar Link	unprocessable
slg-20120930_pre.xml	Edgar Link	unprocessable

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$SLG
SL Green Realty Corp Stock $slg

2012 Q4 Form 10-Q Financial Statement

#000110465912075409 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG SL Green Realty Corp Stock $slg

2012 Q4 Form 10-Q Financial Statement

#000110465912075409 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SLG
SL Green Realty Corp Stock $slg