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Mortgage financings and line of credit (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 03, 2019
Feb. 07, 2018
Jan. 08, 2018
Aug. 26, 2019
Oct. 27, 2017
Feb. 28, 2020
Jan. 31, 2020
Oct. 31, 2019
M&T Bank [Member]                
Debt Instrument [Line Items]                
Loan amount $ 22,500,000              
Basis points, interest rate 2.40%              
Maturity date of loan May 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  
Basis points, interest rate             2.85%  
Loan amount available           $ 121,900,000 $ 121,900,000  
Interest rate cap           3.00% 3.00%  
Maturity date of interest rate cap           Mar. 05, 2021    
Mortgages [Member] | S And A Commercial Associates Limited Partnership [Member]                
Debt Instrument [Line Items]                
Membership interest percentage     65.00%          
Distribution of proceeds from financing     $ 11,200,000          
Provident Bank [Member]                
Debt Instrument [Line Items]                
Basis points, interest rate         2.75%      
Maturity date of loan         Oct. 31, 2022      
Term of the loan         3 years      
Line of credit, prior borrowing capacity             $ 12,800,000  
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       $ 28,815,000        
Interest rate cap       3.54%        
Term of the loan       10 years        
Net proceeds from refinancing of debt       $ 11,600,000        
Percentage of acquisition       100.00%        
Berdan Court, LLC [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Fixed interest rate       3.54%        
Berdan Court, LLC [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Fixed interest rate       6.09%        
WestFREIT, Corp [Member]                
Debt Instrument [Line Items]                
Percentage of acquisition 100.00%