Is it Islamically permissible for a doctor who has rented a clinic to then rent out a part of it to a pharmacy for a fixed amount and a percentage of its daily income, and another part to a laboratory for a fixed amount and a percentage of its daily income?
It is permissible to rent out a leased building, provided that the rent is known and specified, and not an unknown percentage of the income, because ambiguity invalidates the lease contract. In case of invalidity, you are only entitled to the fair market rent.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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