No permit shall be issued for the erection or construction of a depressed garage, attached to a residence, as an accessory use, in a residential zone if any portion of the garage (excepting the foundation) is less than one foot above the street level of the lot upon which the garage is to be erected or constructed; provided, however, that the aforementioned prohibition shall be inapplicable where the entrance to a garage attached to a residence faces away from the public street upon which the dwelling faces, if the elevation of the land behind the garage entrance and further away from the public street is lower than the elevation of the land at the entrance to the aforementioned garage.