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Mortgage financings and line of credit (Details) - USD ($)
1 Months Ended
Jul. 31, 2020
Apr. 03, 2019
Feb. 07, 2018
Feb. 28, 2020
Aug. 26, 2019
Oct. 27, 2017
Jun. 30, 2020
Oct. 31, 2019
Debt Instrument [Line Items]                
Deferred loan payments             $ 722,000  
M&T Bank [Member]                
Debt Instrument [Line Items]                
Loan amount   $ 22,500,000            
Basis points, interest rate   240.00%            
Maturity date of loan   May 01, 2020            
Extended maturity date of loan   Nov. 01, 2020            
Monthly payment of loan   $ 47,250            
Wells Fargo Bank [Member]                
Debt Instrument [Line Items]                
Loan amount     $ 115,300,000          
Aareal Capital Corporation [Member]                
Debt Instrument [Line Items]                
Loan amount     $ 118,500,000          
Basis points, interest rate     2.85%          
Maturity date of loan     Feb. 06, 2021          
Available to draw     $ 3,380,000          
Grande Rotunda LLC [Member]                
Debt Instrument [Line Items]                
Loan amount $ 118,500,000              
Loan amount available       $ 121,900,000        
Interest rate cap       3.00%        
Interest rate 3.01%              
Maturity date of interest rate cap       Mar. 05, 2020        
Provident Bank [Member]                
Debt Instrument [Line Items]                
Basis points, interest rate           2.75%    
Interest rate cap               3.75%
Maturity date of loan           Oct. 31, 2022    
Term of the loan           3 years    
Line of credit, maximum borrowing capacity $ 13,000,000             $ 13,000,000
Berdan Court, LLC [Member]                
Debt Instrument [Line Items]                
Fixed rate mortgage loans         $ 17,000,000      
Loan amount, new         $ 28,815,000      
Fixed interest rate, new loan         3.54%      
Fixed interest rate, old loan         6.09%      
Term of the loan         10 years      
Net proceeds from refinancing of debt         $ 11,600,000      
Percentage of acquisition         100.00%      
WestFREIT, Corp [Member]                
Debt Instrument [Line Items]                
Percentage of acquisition   100.00%            
Westwood Hills Property [Member]                
Debt Instrument [Line Items]                
Loan amount $ 19,200,000              
Maturity date of loan Nov. 01, 2020