Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Rental revenue	$ 110,058	$ 90,204
Tenant expense reimbursement	18,200us-gaap_TenantReimbursements	15,153us-gaap_TenantReimbursements
Observatory revenue	18,223esrt_ObservatoryRevenue	17,301esrt_ObservatoryRevenue
Construction revenue	1,607us-gaap_ConstructionRevenue	14,963us-gaap_ConstructionRevenue
Third-party management and other fees	446us-gaap_ManagementFeesRevenue	611us-gaap_ManagementFeesRevenue
Other revenue and fees	3,348us-gaap_OtherRealEstateRevenue	2,074us-gaap_OtherRealEstateRevenue
Total revenues	151,882us-gaap_Revenues	140,306us-gaap_Revenues
Operating expenses:
Property operating expenses	42,452us-gaap_OperatingCostsAndExpenses	35,860us-gaap_OperatingCostsAndExpenses
Ground rent expenses	2,331esrt_GroundRentExpense	451esrt_GroundRentExpense
Marketing, general, and administrative expenses	9,100	10,155
Observatory expenses	6,977esrt_ObservatoryExpense	6,981esrt_ObservatoryExpense
Construction expenses	2,869us-gaap_ConstructionAndDevelopmentCosts	14,283us-gaap_ConstructionAndDevelopmentCosts
Real estate taxes	22,978us-gaap_RealEstateTaxExpense	18,373us-gaap_RealEstateTaxExpense
Depreciation and amortization	41,418us-gaap_DepreciationAndAmortization	30,115us-gaap_DepreciationAndAmortization
Total operating expenses	128,125us-gaap_OperatingExpenses	116,218us-gaap_OperatingExpenses
Total operating income	23,757us-gaap_OperatingIncomeLoss	24,088us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense	(16,047)us-gaap_InterestExpense	(14,337)us-gaap_InterestExpense
Income before income taxes	7,710	9,751
Income tax benefit	178us-gaap_IncomeTaxExpenseBenefit	1,480us-gaap_IncomeTaxExpenseBenefit
Net income	7,888us-gaap_ProfitLoss	11,231us-gaap_ProfitLoss
Private perpetual preferred unit distributions	(234)	0
Net income attributable to non-controlling interests	(4,516)	(6,862)
Net income attributable to common stockholders	$ 3,138	$ 4,369
Total weighted average shares:
Basic (in shares)	109,400	95,466
Diluted (in shares)	265,810	244,425
Earnings per share attributable to common stockholders:
Basic (USD per share)	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic
Diluted (USD pre share)	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted
Dividends per share	$ 0.085	$ 0.085

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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Other real estate revenue not otherwise specified in the taxonomy.

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