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Major Tenants (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Major Tenants


Tenants
     
2020
 
2019
             
Best Buy Stores, L.P.
 
 
$
240,427
$
204,421
Dollar Tree Stores, Inc.
   
 
137,084
 
137,084
Zale Delaware Inc.
 
 
 
108,584
 
99,784
Fresenius Medical Care of Illinois
   
 
100,336
 
97,889
Aggregate rental income of major tenants
 
 
$
586,431
$
539,178
Aggregate rental income of major tenants
as a percentage of total rental income
 
 
 
88%
 
75%