Wiktionary
unrentable
a. Not fit, suitable or appropriate to be rented.
WordNet
unrentable
adj. not able or fit to be rented; "the house was unrentable in that condition" [ant: rentable]
Usage examples of "unrentable".
Real Estate, had appointed him resident agent in the McGowan Building, and the prospect of unloading an office or two in Old Unrentable this early in his assignment was mightily pleasing.
Adam Smith argued correctly that slavery is unrentable, while he must have seen how Liverpool flourished as the mecca of the international slave trade.