What is the ruling on receiving a sum of money from a tenant who wishes to purchase a plot of land leased from the Awqaf (endowments), and do the heirs have the right to claim their share when another plot of land leased from the Awqaf is sold, which one of the heirs bought from the Awqaf to sell to others?

Taking compensation for a lease is permissible in certain cases, such as in the context of hikr in an endowment (waqf), where the lessee relinquishes their right to lease the endowment in exchange for compensation. This also applies if the lessee pays khulw to the supervisor, or if the contract is still valid. As for the building constructed by the grandfather and the khulw paid for it, it is owned by all the heirs, and the price of its sale or its rent is their right.