Organization (Details)	12 Months Ended
Dec. 31, 2019 ft² property
Real Estate Properties [Line Items]
Number of Properties \| property	62
Square Feet \| ft²	18,756,259
Customer Concentration Risk \| Rentable Square Feet \| 15 largest tenants
Real Estate Properties [Line Items]
Contribution risk, percentage	31.80%
Customer Concentration Risk \| Rentable Square Feet \| Technology Sector
Real Estate Properties [Line Items]
Contribution risk, percentage	30.30%
Customer Concentration Risk \| Rentable Square Feet \| Media And Entertainment Sector
Real Estate Properties [Line Items]
Contribution risk, percentage	18.50%
California \| Geographic Concentration Risk
Real Estate Properties [Line Items]
Contribution risk, percentage	81.50%
Joint Venture, Blackstone Property Partners
Real Estate Properties [Line Items]
Joint venture, ownership percentage	20.00%
Consolidated portfolio
Real Estate Properties [Line Items]
Number of Properties \| property	60
Square Feet \| ft²	16,829,117
Consolidated portfolio \| Office
Real Estate Properties [Line Items]
Number of Properties \| property	51
Square Feet \| ft²	13,373,338
Consolidated portfolio \| Studio
Real Estate Properties [Line Items]
Number of Properties \| property	3
Square Feet \| ft²	1,224,403
Consolidated portfolio \| Land
Real Estate Properties [Line Items]
Number of Properties \| property	6
Square Feet \| ft²	2,231,376
Unconsolidated portfolio
Real Estate Properties [Line Items]
Number of Properties \| property	2
Square Feet \| ft²	1,927,142
Unconsolidated portfolio \| Office
Real Estate Properties [Line Items]
Number of Properties \| property	1
Square Feet \| ft²	1,477,142
Unconsolidated portfolio \| Land
Real Estate Properties [Line Items]
Number of Properties \| property	1
Square Feet \| ft²	450,000

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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