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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) officeAsset | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Investments in and Advances to Affiliates [Line Items] |  |  |
Investment balance |  | $ 51,021 | $ 56,464
NNN Office JV LP |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage |  | 20.00% |
Investment balance |  | $ 26,030 | 31,615
Etna Park 70 LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage |  | 90.00% |
Investment balance |  | $ 12,857 | 12,514
Etna Park East LLC |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage |  | 90.00% |
Investment balance |  | $ 7,979 | 7,484
BSH Lessee L.P. |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Ownership percentage |  | 25.00% |
Investment balance |  | $ 4,155 | $ 4,851
Mortgages | NNN Office JV LP |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Non-recourse mortgage loan | $ 40,800 |  |
NNN Office Joint Venture Properties | NNN Office JV LP |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Number of properties sold | officeAsset | 2 |  |
Aggregate gain on sale of properties | $ 557 |  |
Aggregate gross disposition price | $ 8,504 |  |

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