Sentence 1: We live in a basement unit in a condo. 
 Sentence 3: One day a neighbor told us he thought he saw a rat near our door 
 Sentence 4:  I called the property manager and he sent an exterminator 
 Sentence 5:  Luckily we never saw the rat 
 Option 1: The condo burned down one day. 
 Option 2: The basement level contains the laundry.