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Real Estate - Major Components of Assets and Liabilities Related to Real Estate Held for Sale (Details) - Griffin Capital Essential Asset REIT, Inc. [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets | $ 2,711 | $ 2,959
Total liabilities | 293 | 537
Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total real estate | 3,575 | 3,575
Less: accumulated depreciation and amortization | (868) | (794)
Total real estate, net | 2,707 | 2,781
Other assets | 4 | 178
Total assets | 2,711 | 2,959
Accrued expenses and other liabilities | 288 | 527
Accrued expenses and other liabilities | 5 | 10
Total liabilities | 293 | 537
Land | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total real estate | 589 | 589
Building and improvements | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total real estate | 2,493 | 2,493
Tenant origination and absorption costs | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total real estate | $ 493 | $ 493

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