Each such parking space shall provide a minimum of 200 square feet of off-street paved parking surface, exclusive of the space needed for access and maneuvering. Such off-street parking space may be provided as an individual garage or carport or a parking compound adjacent to or near the apartment it serves but not closer than 20 feet to an apartment wall containing windows or 10 feet to a blank wall, except when located within the apartment house. A maximum of 40 individual parking spaces may be placed together in a parking compound. All such compounds of parking spaces must be separated by a planting strip not less than 10 feet in width. Parking access shall be screened by a substantial wall, fence, thick hedge or other equivalent visual screen with a height of not less than six feet and approved by the Board of Commissioners. No parking space shall be located within 10 feet of any lot line inside or near yards or within any front yard, except that parking areas may be located within 10 feet of front lot lines, provided that the parking areas are screened by a continuous wall, hedge, shrubbery, landscaped grade changes or other equivalent visual barrier not less than six feet high and interrupted only at entrances and exits.