Common parking facilities may be provided in lieu of the individual requirements contained herein, provided the total of such off-street parking spaces, when used together, shall not be less than the sum of the various uses computed separately. If the common facilities are located on more than one (1) parking lot, a covenant for the preservation of the parking must be filed in accordance with the provisions of Section 16.26.120. (PZSC § 03-12-015 (6))