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COVID-19 - Collections and Agreements with Tenants (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 04, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Bad debt expense |  |  |  | $ 2,311,000 | $ 73,000
COVID-19 Pandemic |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Bad debt expense |  |  | $ 1,361,000 | $ 1,856,000 |
COVID-19 Pandemic, Billings In Prior Quarters |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Bad debt expense |  |  | 422,000 |  |
Office and Retail |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and Other Property Income Billed to Tenants |  |  | $ 14,250,689 |  |
% Collected |  |  | 95.50% |  |
% Collected by Applying the Security Deposit |  |  | 0.10% |  |
% Deferred |  |  | 0.20% |  |
% Recorded as Bad Debt |  |  | 1.50% |  |
% Abated |  |  | 0.00% |  |
Office and Retail | Subsequent Event |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and Other Property Income Billed to Tenants |  | $ 4,333,864 |  |  |
% Collected |  | 92.80% |  |  |
% Collected by Applying the Security Deposit |  | 0.00% |  |  |
% Deferred |  | 0.00% |  |  |
% Recorded as Bad Debt |  | 0.00% |  |  |
% Abated |  | 0.00% |  |  |
Office and Retail | Subsequent Event | Three Months Ended September 30, 2020 |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and other property income billed to tenants, additionally collected | 1.40% |  |  |  |
Office and Retail | Subsequent Event | October 2020 |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and other property income billed to tenants, additionally collected | 0.20% |  |  |  |
Parking |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and Other Property Income Billed to Tenants |  |  | $ 1,157,579 |  |
% Collected |  |  | 34.90% |  |
% Collected by Applying the Security Deposit |  |  | 0.00% |  |
% Deferred |  |  | 0.00% |  |
% Recorded as Bad Debt |  |  | 62.60% |  |
% Abated |  |  | 0.00% |  |
Parking | Subsequent Event |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Rental and Other Property Income Billed to Tenants |  | $ 351,202 |  |  |
% Collected |  | 19.20% |  |  |
% Collected by Applying the Security Deposit |  | 0.00% |  |  |
% Deferred |  | 0.00% |  |  |
% Recorded as Bad Debt |  | 0.00% |  |  |
% Abated |  | 0.00% |  |  |

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