Is it permissible to rent a building to a co-educational school – girls and boys – in a country that prohibits non-co-educational schools, and given the potential for moral laxity therein? And is it permissible to rent it to a company where there is intermingling between men and women?

If the rental is for a forbidden purpose, it is not permissible. However, if it is for a permissible purpose, then it is permissible. The sin for any forbidden act committed by the tenant falls upon them, not upon the landlord. Thus, renting out a house to be used as a high school or a company engaged in a permissible activity is permissible. There is no sin upon the landlord for any mixing that occurs, because he rented out his house for a permissible activity and did not rent it out for a forbidden act.