All required parking spaces shall be located on the same lot as the use with which such spaces are connected, or, in the case of unenclosed spaces, within 200 feet of the lot, except that two or more businesses may jointly provide the required spaces on one or more of their lots. The number of spaces in any such joint facilities shall at least equal the total number required under the provisions of this article for their individual uses, provided that the distance between the businesses and joint parking facilities shall not exceed 250 feet.