This is not permissible, but it is permissible to sell them and use the money for other needs of 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.
There is no issue with it if it doesn’t disturb the worshippers and it doesn’t reduce the place for performing prayers and it is a necessity for the mosque.
The obligatory precaution demands that infidels be prevented from entering mosques except when they intend to research about Islam and like that.
Precaution demands that the permission of the custodian be obtained but if the custodian of the mosque disagrees with what is in the interest of the mosque or he doesn’t pay attention to them, the board of trustees can obtain the permission of the religious authority in that matter.
There is no problem with it if the mosque is not decorated with gold and the picture of living creatures and on the condition that it does not lead to extravagance and the wasting of resources.
Demolishing a mosque is not permissible but if it collapses itself it is permissible to use its materials to rebuild the mosque of that village or other places.
Performing these acts in the mosque is not prohibited and there is no need for the permission of the religious authority. However, attending to worldly acts in the mosque is considered to be makrūh and if these acts disturb the worshippers in the mosque they are prohibited.
It is not permissible based on the obligatory precaution; however you can open a door from one mosque to the other.
If rows of women are behind men there is no need for a curtain but if they are beside each other the obligatory precaution demands that a curtain separates them.
