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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) a | Sep. 30, 2020 USD ($) partnership officeAsset | Sep. 30, 2019 USD ($) officeAsset | Dec. 31, 2019 USD ($) a | Dec. 31, 2017 a
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Investment balance |  |  | $ 56,489 |  | $ 57,168 |
Number of joint venture interests | partnership |  |  | 1 |  |  |
Non-consolidated Real Estate Entity |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage | 15.00% |  |  |  |  |
NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 20.00% |  |  |
Investment balance |  |  | $ 32,723 |  | 39,288 |
Etna Park 70 LLC |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 90.00% |  |  |
Investment balance |  |  | $ 11,352 |  | 8,352 |
Area of land (in acres) | a |  | 57 |  |  |  | 151
Payments to acquire interest in joint venture |  | $ 3,008 |  |  |  |
Etna Park East LLC |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 90.00% |  |  |
Investment balance |  |  | $ 7,391 |  | $ 4,310 |
Area of land (in acres) | a |  |  |  |  | 129.6 |
Other Joint Ventures |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  | 25.00% |  |  |
Investment balance |  |  | $ 5,023 |  | $ 5,218 |
Mortgages | NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Non-recourse mortgage loan |  |  | $ 40,800 | $ 101,520 |  |
NNN Office Joint Venture Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Aggregate gain on sale of properties | $ 824 |  |  |  |  |
NNN Office Joint Venture Properties | NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Number of properties sold | officeAsset |  |  | 2 | 4 |  |
Aggregate gain on sale of properties |  |  | $ 557 | $ 3,529 |  |
Aggregate gross disposition price |  |  | $ 8,504 | $ 45,208 |  |
Office Building |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Proceeds from sale of joint venture | $ 2,317 |  |  |  |  |

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