In all residential districts there shall be at least one enclosed garage for each dwelling unit hereafter erected. A garage for not more than three vehicles may be erected on a single lot. Not more than two commercial vehicles with not more than two axles each and each not exceeding an overall length of 20 feet and an overall height of 10 feet shall be permitted on said lot, and if there are two such vehicles, at least one shall be garaged regularly. Only commercial vehicles owned or operated by occupants of the principal residential dwelling located on said lot shall be permitted thereon.

In all residential districts, any garage which is demolished, destroyed or made a part of the dwelling unit shall be required to be replaced with another garage.

Garages shall not have an exterior staircase to the attic or second floor area.