A Musjid has many shops which are hired out for rental income which is used for the maintenance of the Musjid.

Answer

It is haraam. Banks are the primary structures of Riba. Aiding sin is haraam. There is no such thing as an 'islamic' bank. All banks are haraam capitalist riba institutions. Do not be deceived by the satanically adorned 'islamic' terminology which these so-called 'islamic' banks employ to ensnare ignorant Muslims.