Building two-storey Masjids

Q: Is it permissible to offer Salah (prayer) in a two-storey Masjid (mosque) that has no windows except for the hole of the stairs? There is no opening over the mihrab. Moreover, the followers do not see the Imam.

A: It is permissible to have a two-storey Masjid. But there should be an opening that connects the two floors near the place of the Imam in order that worshippers might hear the Imam if the electricity turns off.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.