Is it permissible to invest in an apartment that the government rents from you for 150,000 dirhams, from which 24,000 dirhams are deducted, while you rent it out for 48,000 dirhams, knowing that subleasing is prohibited? If it is not permissible, must the money received from the subtenant be returned?

There is no harm in an employee subletting a government apartment if the regulations do not prohibit it and if you have the right to benefit from the leased property. However, if there is a condition in the contract that prevents subletting, then it is not permissible, because the Prophet, peace be upon him, said: "Muslims are bound by their conditions." The owner's permission and approval for subletting must be obtained. There is no need to return the rent to the subtenant; rather, one should repent to Allah if a condition of the government or the owner was violated.