They could put a 36 hour waiting period on the apartments/houses after it was disowned. So in other words no player can buy the vacant apartment/house until 36 hours has elapse or add in a RNG factor that sometime within a 36 hour period the apartment/house will be available no sooner than 5 hours after it was disowned.

This alone would prevent selling because who would camp by a house or an apartment for 36 hours.