Condensed Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Oct. 06, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Rental revenue	$ 79,987
Tenant expense reimbursement	15,836
Observatory revenue	23,735
Construction revenue	5,265
Third-party management and other fees	550
Other revenue and fees	2,210
Total revenues	127,583		260,294	294,788
Operating expenses:
Property operating expenses	34,453
Marketing, general, and administrative expenses	15,254
Observatory expenses	5,687
Construction expenses	5,468
Real estate taxes	17,191
Formation transaction expenses	0
Depreciation and amortization	27,375
Total operating expenses	105,428
Operating income	22,155
Other income (expense):
Equity in net income of non-controlled entities	0	14,875	14,348	3,893
Interest expense	(13,147)
Settlement expense	0
Acquisition expenses	(138,140)
Gain on consolidation of non-controlled entities	322,563
Net income (loss)	193,431		48,643	57,397
Net loss (income) attributable to the predecessor	0
Net income attributable to non-controlling interests	(118,186)
Net income attributable to Empire State Realty Trust, Inc.	75,245
Total weighted average shares:
Basic (in shares)	95,574
Diluted (in shares)	95,611
Net income per share attributable to Empire State Realty Trust, Inc.:
Basic earnings per share (in dollars per share)	$ 0.79
Diluted earnings per share (in dollars per share)	$ 0.79
Predecessor [Member]
Revenues:
Rental revenue		148,690	196,187	198,494
Tenant expense reimbursement		21,272	29,483	31,063
Observatory revenue		0	0	0
Construction revenue		18,636	18,902	47,560
Third-party management and other fees		5,067	5,103	5,626
Other revenue and fees		12,407	10,619	12,045
Total revenues		206,072	260,294	294,788
Operating expenses:
Property operating expenses		41,297	55,707	57,102
Marketing, general, and administrative expenses		23,600	20,963	15,688
Observatory expenses		0	0	0
Construction expenses		19,821	19,592	46,230
Real estate taxes		24,331	30,406	29,160
Formation transaction expenses		4,507	2,247	2,845
Depreciation and amortization		38,963	42,690	35,513
Total operating expenses		152,519	171,605	186,538
Operating income		53,553	88,689	108,250
Other income (expense):
Equity in net income of non-controlled entities		14,875	14,348	3,893
Interest expense		(50,660)	(54,394)	(54,746)
Settlement expense		(55,000)	0	0
Acquisition expenses		0	0	0
Gain on consolidation of non-controlled entities		0	0	0
Net income (loss)		(37,232)	48,643	57,397
Net loss (income) attributable to the predecessor		37,232	(48,643)	(57,397)
Net income attributable to non-controlling interests		0	0	0
Net income attributable to Empire State Realty Trust, Inc.		$ 0	$ 0	$ 0