He was asked—may Allah have mercy on him:

A plot of land endowed for a mosque contains trees that bear no fruit and prevent the land from being cultivated. Is it permissible to uproot the trees and spend the proceeds from their sale on the mosque’s needs, so that the land may be cultivated and put to use?

He answered:

Yes. If uprooting the trees benefits the land by allowing greater use to be made of it, they should be uprooted. The endowment’s administrator should uproot them and do whatever best serves the endowment. He should spend the proceeds from their sale on whatever is most beneficial to the endowment, whether maintaining the endowed property or a mosque, if such work is needed. And Allah knows best.

He was asked:

A burial chamber was built in a mosque’s summer prayer area, then demolished pursuant to a ruling of Islamic law. The mosque has a privy, but there is no room in it for ablution. Is it permissible to provide a place for ablution in the summer prayer area while leaving undisturbed whatever is inside the chamber that had been built as a grave?