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In all districts, as indicated, all required accessory off-street parking spaces may be provided in facilities designed to serve jointly two or more buildings or zoning lots, provided that:

(a)        the number of spaces in such joint facilities shall be not less than that required in the following Sections for the combined number of dwelling units or the combined floor area, lot area, rated capacity, or other such unit of measurement in such buildings or zoning lots:

Section 25-21        (General Provisions)

Section 25-31        (General Provisions)

Section 25-32        (Special Provisions for a Single Zoning Lot With Uses Subject to Different Parking Requirements);

(b)        all such spaces are located in a district where they are permitted under the applicable provisions of Sections 25-52 (Off-Site Spaces for Residences), 25-53 (Off-site Spaces for Permitted Non-residential Uses), or 73-45 (Modification of Off-site Parking Provisions); and

(c)        the design and layout of such joint facilities meet standards of adequacy set forth in regulations promulgated by the Commissioner of Buildings.