Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commercial real estate properties, at cost:
Land	$ 201,196us-gaap_Land	$ 201,196us-gaap_Land
Development costs	7,332us-gaap_DevelopmentInProcess	6,986us-gaap_DevelopmentInProcess
Building and improvements	1,967,260	1,931,681
Commercial real estate properties, at cost	2,175,788	2,139,863
Less: accumulated depreciation	(399,851)	(377,552)
Commercial real estate properties, net	1,775,937us-gaap_RealEstateInvestmentPropertyNet	1,762,311us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	36,463	45,732
Restricted cash	61,007	60,273
Tenant and other receivables, net of allowance of $2,803 and $1,427 in 2015 and 2014, respectively	12,759us-gaap_AccountsAndNotesReceivableNet	23,745us-gaap_AccountsAndNotesReceivableNet
Deferred rent receivables, net of allowance of $437 and $420 in 2015 and 2014, respectively	106,226us-gaap_DeferredRentReceivablesNet	102,104us-gaap_DeferredRentReceivablesNet
Prepaid expenses and other assets	30,715us-gaap_PrepaidExpenseAndOtherAssets	48,504us-gaap_PrepaidExpenseAndOtherAssets
Deferred costs, net	95,551	80,212
Acquired below-market ground leases, net	389,765us-gaap_GroundLeasesNet	391,887us-gaap_GroundLeasesNet
Acquired lease intangibles, net	273,086us-gaap_FiniteLivedIntangibleAssetsNet	290,248us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill	491,479us-gaap_Goodwill	491,479us-gaap_Goodwill
Total assets	3,272,988us-gaap_Assets	3,296,495us-gaap_Assets
Liabilities:
Mortgage notes payable	855,032us-gaap_LongTermDebt	903,985us-gaap_LongTermDebt
Senior unsecured notes	588,335us-gaap_ConvertibleDebt	237,667us-gaap_ConvertibleDebt
Unsecured revolving credit facility	165,000us-gaap_UnsecuredDebt	0us-gaap_UnsecuredDebt
Term loan and credit facility	0us-gaap_LineOfCredit	470,000us-gaap_LineOfCredit
Accounts payable and accrued expenses	101,797esrt_AccountsPayableandAccruedExpenses	96,563esrt_AccountsPayableandAccruedExpenses
Acquired below-market leases, net	129,736us-gaap_BelowMarketLeaseNet	138,859us-gaap_BelowMarketLeaseNet
Deferred revenue and other liabilities	20,994esrt_DeferredRevenueandOtherLiabilities	27,876esrt_DeferredRevenueandOtherLiabilities
Tenants’ security deposits	44,388us-gaap_SecurityDepositLiability	40,448us-gaap_SecurityDepositLiability
Total liabilities	1,905,282us-gaap_Liabilities	1,915,398us-gaap_Liabilities
Commitments and Contingencies
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2015 and 2014	8,004	8,004
Total capital	1,367,706us-gaap_PartnersCapital	1,381,097us-gaap_PartnersCapital
Total liabilities and capital	3,272,988	3,296,495
Series PR operating partnership units
Capital:
ESRT partner's capital (2,675,558 and 2,671,043 general partner operating partnership units and 109,071,783 and 104,520,844 limited partner operating partnership units outstanding in 2015 and 2014, respectively)	482,043	468,638
Limited partner operating partnership units	846,104	868,163
Series ES operating partnership units
Capital:
Limited partner operating partnership units	23,117	26,488
Series 60 operating partnership units
Capital:
Limited partner operating partnership units	5,653	6,567
Series 250 operating partnership units
Capital:
Limited partner operating partnership units	$ 2,785	$ 3,237

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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- Details

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