What is the validity of the aforementioned will, according to Sharia, and are there alternatives for its implementation, especially regarding the endowment of the land and the transfer of ownership of the apartment?

A bequest is valid for one-third or less, and it is not permissible for more than that. Similarly, a bequest to an heir is forbidden. The bequest in excess of one-third is not enforceable unless all heirs agree. It is necessary to refer to the Sharia Court to execute the endowed bequest and to determine whether the land, along with the other bequests, falls within the one-third limit or not, and how the pro-rata distribution will be made between the endowment and the needy if the bequests exceed one-third. If the estate is insufficient to cover the bequests, then the deficit will be proportionally distributed among all of them.