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Bonds Payable (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Bonds Payable
The outstanding balance of our Bonds at September 30, 2021 and December 31, 2020 is as follows:
Bond IssuanceSeptember 30, 2021December 31, 2020Interest RateMaturity
Series A Bonds(1)$63,147 $95,133 7.30 %7/31/23
Series B Bonds(1)52,029 65,318 6.80 %7/31/25
Series C Bonds(2)75,281 85,537 4.65 %1/31/23
190,457 245,988 
Less unamortized deferred issuance costs(6,259)(8,100)
$184,198 $237,888 
(1)    The bonds are collateralized by the assets of SPC.
(2)    The bonds are collateralized by a trust deed in Browning Place, a 625,297 square foot office building in Farmers Branch, Texas.