Debt instrument, maturity date in month and year.

No definition available.

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- Definition

This element represents the number of extension options available on a debt instrument after the stated maturity date.

+ References

No definition available.

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- Definition

This element represents the duration of the extension from the maturity date in years.

+ References

No definition available.

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- Definition

Economic interest percentage.

+ References

No definition available.

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- Definition

Economic interest percentage including indirect interest.

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No definition available.

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- Definition

Ownership interest in real estate funds.

+ References

No definition available.

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Period Type:	duration

- Definition

Percentage of interest acquired.

+ References

No definition available.

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- Definition

Percentage of ownership interest in joint venture held by co venturer.

+ References

No definition available.

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Period Type:	instant

- Definition

Third party ownership interest in real estate funds.

+ References

No definition available.

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- Definition

Area of a real estate property.

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No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of assets acquired at the acquisition date.

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Balance Type:	debit
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- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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.

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- Definition

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

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- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Balance Type:	debit
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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.

+ References

No definition available.

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Investments in Unconsolidated Joint Ventures - Additional Information (Details)				9 Months Ended
	Aug. 21, 2019 USD ($) ft²	Mar. 29, 2019	Feb. 07, 2019 USD ($) ft² Extensions	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items]
Area of office and retail properties \| ft²				12,400,000
Mortgage financing loan amount				$ 3,200,000	$ 16,700,000
Mortgage loan				$ 3,603,000,000		$ 3,599,800,000
RDF [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage in residential fund		7.40%
Percentage of interest third party ownership		92.60%
111 Sutter Street [Member]
Schedule Of Equity Method Investments [Line Items]
Area of office and retail properties \| ft²			293,000
Business combination, consideration transferred			$ 227,000,000
Percentage of ownership interest in new joint venture			49.00%	49.00%
Percentage of ownership interest in joint venture held by co-venturer			51.00%
Mortgage financing loan amount			$ 138,200,000
Debt instrument, term			4 years
Debt instrument number of extensions \| Extensions			3
Debt instrument term of extension			1 year
111 Sutter Street [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Schedule Of Equity Method Investments [Line Items]
Mortgage financing loan, interest only basis points at LIBOR			2.15%
One Steuart Lane [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in new joint venture				35.00%
Property funds, ownership percentage		1.85%		2.60%
One Steuart Lane [Member] \| RDF [Member]
Schedule Of Equity Method Investments [Line Items]
Property funds, ownership percentage		25.00%		35.00%
Percentage of interest acquired				10.00%
Additional interest acquired amount				$ 19,110,000
55 Second Street [Member]
Schedule Of Equity Method Investments [Line Items]
Area of office and retail properties \| ft²	384,000
Percentage of ownership interest in new joint venture				44.10%
Mortgage financing loan amount	$ 50,000,000
Transaction valued property value	401,700,000
Mortgage loan assumed in connection with acquisition	$ 137,500,000
Mortgage loan				$ 187,500,000
Mortgage financing loan, interest-only at fixed rate	3.88%
Mortgage financing loan, maturity period	2026-10