Except in Zoning District with "DT" restrictions, all buildings and structures hereafter erected, constructed, reconstructed or altered shall be provided with off-street parking space, either in the form of parking garages or open parking area, for parking of motor vehicles in accordance with the following minimum requirements. In a residence district, no part of an off-street parking area, driveways excluded, shall be located in the required front yard. All loading areas shall be so located that delivery or loading vehicles shall not obstruct streets, walks or public rights-of-way.