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v3.20.4

Organization and Ownership - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2020 ft² a property building property_partnership project | Dec. 31, 2019
Real Estate Properties [Line Items] |  |
Lease-up properties occupancy percentage | 95.00% |
Lease-up properties occupancy duration | 1 year |
Stabilized Residential Units in San Diego, CA [Member] |  |
Real Estate Properties [Line Items] |  |
Number of Units | 608 |
101 First LLC and 303 Second LLC [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | property_partnership | 2 |
Ownership interest | 56.00% |
Redwood LLC [Member] |  |
Real Estate Properties [Line Items] |  |
Ownership interest | 93.00% |
Operating Partnership [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | property_partnership | 3 |
Ownership interest | 99.00% | 98.10%
Operating Partnership [Member] | Non-Affiliated Investors [Member] |  |
Real Estate Properties [Line Items] |  |
Ownership interest of noncontrolling interest | 1.00% | 1.90%
Washington [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | 8 |
Number of development projects | 1 |
Number of future development projects | 1 |
Stabilized Portfolio [Member] |  |
Real Estate Properties [Line Items] |  |
Number of development projects | 4 |
Office properties [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | building | 117 |
Office properties [Member] | Operating Partnership [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | 4 |
Office properties [Member] | San Francisco, California [Member] | 101 First LLC and 303 Second LLC [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Office properties [Member] | Redwood City, California [Member] | Redwood LLC [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | 2 |
Development sites [Member] |  |
Real Estate Properties [Line Items] |  |
Number of properties | project | 5 |
Area of undeveloped land | a | 61 |
Properties and development projects [Member] |  |
Real Estate Properties [Line Items] |  |
Property ownership percentage | 100.00% |
Development Project in San Francisco [Member] | Stabilized Office Properties [Member] | San Francisco, California [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 750,370 |
Development Project in Hollywood [Member] | Stabilized Office Properties [Member] | Hollywood, California [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 361,388 |
Development Project in San Diego, California [Member] | Stabilized Retail Space [Member] | San Diego, California [Member] |  |
Real Estate Properties [Line Items] |  |
Area of real estate property | ft² | 95,871 |

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