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Bonds Payable (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Bonds Payable | The outstanding balance of our Bonds at December 31, 2020 and 2019 is as follows:
|  | December 31, |  |  |  |
Bond Issuance |  | 2020 |  | 2019 |  | Interest Rate |  | Maturity
Series A Bonds(1)(2) |  | 95,133 |  |  | 92,653 |  |  | 7.30 | % |  | 7/31/23
Series B Bonds(3) |  | 65,318 |  |  | 60,764 |  |  | 6.80 | % |  | 7/31/25
Series C Bonds(2) |  | 85,537 |  |  | 79,572 |  |  | 4.65 | % |  | 1/31/23
|  | 245,988 |  |  | 232,989 |  |  |  |  |
Less unamortized deferred issuance costs |  | (8,100) |  |  | (9,724) |  |  |  |  |
|  | 237,888 |  |  | 223,265 |  |  |  |  |
(1) On November 30, 2020, we issued $19,693 in additional bonds for $18,822 in net proceeds. (2) The bonds are collateralized by the assets of SPC. (3) The bonds are collateralized by a trust deed in Browning Place, a 625,297 square foot office building in Farmers Branch, Texas.
Schedule of Maturities of Bonds Payable | The aggregate maturities of our Bonds are as follows:
Year |  | Amount
2021 |  | $ | 44,775 |
2022 |  | 44,775 |
2023 |  | 130,310 |
2024 |  | 13,064 |
2025 |  | 13,064 |
|  | $ | 245,988 |

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