All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The basic principle is that it is permissible to rent a house to someone who rents it for a permissible purpose, even if the tenant is a non-Muslim.
Al-Mudawwanah reads:
“I (the author) said: “If I rent my house to a Christian man, or a Jew or Magi, is that permissible according to the view of Maalik?”
He replied: “Yes, as long as he does not rent it to sell alcohol or pigs in it.” [End of quote]
Therefore, as long as your father rented the house for a permissible purpose and did not rent it out for a forbidden purpose, then the rent is lawful, and the rent fee is permissible.
Allah Knows best.