Building Shops and Malls in the Underground level of the Mosque
If a mosque is situated a few meters above the ground and it doesn’t have an underground floor is it permissible to build a shop under the mosque and sell its right of trade and consume the money for the mosque?
It is not permitted, but if the person who devoted the land for the mosque has allowed it, it will be permissible. However, there is no issue with constructing things like libraries in the basement of the mosques.
