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Note 4 - Investments In and Advances to Real Estate Joint Ventures - Joint Venture Investments Accounted for Under the Equity Method, Debt Details (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Mortgage and notes payable |  | $ 1,486.6 | $ 1,541.0
Prudential Investment Program [Member] |  |  |
Mortgage and notes payable |  | $ 494.6 | $ 495.8
Weighted average interest rate |  | 2.03% | 2.05%
Weighted average remaining term (Month) | [1] | 34 months 6 days | 37 months 6 days
KIR [Member] |  |  |
Mortgage and notes payable |  | $ 524.3 | $ 536.9
Weighted average interest rate |  | 3.27% | 3.87%
Weighted average remaining term (Month) | [1] | 28 months 27 days | 25 months 9 days
CPP [Member] |  |  |
Mortgage and notes payable |  | $ 85.0 | $ 84.9
Weighted average interest rate |  | 3.25% | 3.25%
Weighted average remaining term (Month) | [1] | 27 months | 30 months
Other Joint Venture Programs [Member] |  |  |
Mortgage and notes payable |  | $ 382.7 | $ 423.4
Weighted average interest rate |  | 3.59% | 3.41%
Weighted average remaining term (Month) | [1] | 89 months 24 days | 86 months 21 days
[1] | Includes extension options

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