Description of fair market property value determination.

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- Definition

Minimum percentage of floor price required to be appraised value of property

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No definition available.

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- Definition

Ownership percentage for tenants in common interest in property.

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- Definition

Percentage increase in fair market value of property based on lease amendment.

+ References

No definition available.

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- Definition

Minimum duration in years from the time of the original sale that the purchase of the property could be made.

+ References

No definition available.

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Duration of time from the period of sale that the put right may be exercised by the partner.

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- Definition

Minimum duration of a put right notice required to be provided by the partner to exercise the put right.

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No definition available.

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- Definition

Right o acquire period after completion of initial public offering.

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- Definition

Area of a real estate property.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Commitments and Contingencies - Additional Information (Details) - ft²	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2013
Other Commitments [Line Items]
Prime retail space of building	10,400,000
60 Wall Street [Member]
Other Commitments [Line Items]
Right to acquire period after completion of initial public offering	2 years
Description of fair market property value determination	In order to determine the fair market value of the property, we will obtain three independent appraisals from nationally recognized valuation firms and the fair market value will be deemed to be the average of the two highest appraisals; provided that the fair market value will be subject to a minimum floor price equal to 95% of the appraised value of the property as of December 31, 2013.
Minimum percentage of floor price required to be appraised value of property		95.00%
718 Fifth Avenue [Member]
Other Commitments [Line Items]
Put right exercise period after sale of interest	4 years
Put right notice period	12 months
Put right actual purchase period	5 years
712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Percentage of tenancy-in-common interest in property	50.00%
Predecessor [Member] \| 712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Owned by Affiliate [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member] \| Third Party Affiliate [Member]
Other Commitments [Line Items]
Equity method ownership percentage	25.00%
Owned by Affiliate [Member] \| Parent Company [Member] \| Put Right Exercised [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	25.00%
Owned by Affiliate [Member] \| Fund II and Fund III [Member] \| 60 Wall Street [Member]
Other Commitments [Line Items]
Percentage of ownership in joint venture	62.30%
Owned by Affiliate [Member] \| Retail Type Space [Member] \| 60 Wall Street [Member]
Other Commitments [Line Items]
Prime retail space of building	1,625,483
Owned by Affiliate [Member] \| Retail Type Space [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Prime retail space of building	19,050
Minimum \| 60 Wall Street [Member]
Other Commitments [Line Items]
Percentage increase in fair market value of property based on lease amendment	1.00%