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Related Person Transactions - RMR Office Property Fund LP (Details) - Open End Fund $ in Thousands | Jul. 28, 2020 USD ($) | Aug. 31, 2018 USD ($) property
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RMR LLC |  |
Related Party Transaction [Line Items] |  |
Committed capital | $ 100,000 | $ 100,000
ABP Trust |  |
Related Party Transaction [Line Items] |  |
Number of properties contributed | property |  | 15
Value of property contributed |  | $ 206,300

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