Organization (Details) ft² in Thousands	12 Months Ended
Dec. 31, 2018 ft² segment property subsidiary market
Real Estate Properties [Line Items]
Number of wholly owned subsidiaries \| subsidiary	2
Percentage ownership by sole general partner	99.90%
Percentage ownership by sole limited partner	0.10%
Number of real estate properties \| property	4
Rentable square feet \| ft²	16,200
Percentage of annualized lease revenue	92.00%
Number of operating segments \| segment	1
US
Real Estate Properties [Line Items]
Number of office markets \| market	8
In-Service Office Properties
Real Estate Properties [Line Items]
Number of real estate properties \| property	54
Percentage of Class A commercial office space	93.30%
Redevelopment Asset
Real Estate Properties [Line Items]
Rentable square feet \| ft²	487

Number Of Wholly Owned Management Subsidiaries

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- Definition

Operating Leases, Income Statement, Percentage of Annualized Lease Revenue

+ References

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- Definition

Real Estate Investments, Number of Office Markets

+ References

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- Definition

Real Estate Properties Leased Percent

+ References

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- Definition

Area of a real estate property.

+ References

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- Definition

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

+ References

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

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

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

+ References

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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

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