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Description of Business and Organization Narrative (Details) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended									6 Months Ended
	Oct. 06, 2013 entity	Jun. 30, 2013 entity	Jun. 30, 2014 entity sqft	Jun. 30, 2014 Office Building [Member] office_and_property sqft	Jun. 30, 2014 Office Building [Member] Manhattan [Member] office_and_property sqft	Jun. 30, 2014 Office Building [Member] Fairfield County, Connecticut and Westchester County, New York [Member] sqft office_and_property	Jun. 30, 2014 Development Parcel [Member] parcel	Jun. 30, 2014 Retail Site [Member] Manhattan and Westport, Connecticut [Member] sqft	Jun. 30, 2014 Retail Site [Member] Manhattan [Member] office_and_property sqft	Jun. 30, 2014 Retail Site [Member] Westport, Connecticut [Member] office_and_property	Jun. 30, 2014 Other Property [Member] Stamford, Connecticut [Member] sqft	Jun. 30, 2014 ESRT [Member]	Jun. 30, 2014 Common Class A [Member] ESRT [Member]	Jul. 15, 2014 Subsequent Event [Member] office_and_property	Jul. 15, 2014 Subsequent Event [Member] Office Building [Member] sqft	Jul. 15, 2014 Subsequent Event [Member] Retail Site [Member] sqft
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value													$ 0.01
OP units owned by the Company, percent			38.90%									38.90%
Area of real estate property			8,400,000	7,800,000	5,900,000	1,800,000		204,175	415,339		380,000				1,500,000	112,270
Number of properties				12	7	5	1		4	2				2
Number of entities to be treated as TRS's			2
Number of entities acquired	4	4

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Number of Entities to be Treated as Taxable REIT Subsidiary

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- Definition

Area of a real estate property.

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- Definition

Face amount or stated value per share of common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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The number of businesses acquired by the entity during the period.

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The number of real estate properties owned as of the balance sheet date.

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