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Related Party Transactions - Participation Interests Purchased (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Related Party Transaction    
Principal Balance $ 482,089,565 $ 424,174,758
Carrying Value $ 480,462,652 $ 422,280,515
LD Milpitas Mezz, LP    
Related Party Transaction    
Participating Interests   25.00%
Principal Balance   $ 4,250,000
Carrying Value   $ 4,294,053