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In all districts, as indicated, except as provided in Section 44-53 (Special Provisions for a Single Zoning Lot With Uses Subject to Different Loading Requirements), if any building or zoning lot is used partly for wholesale, manufacturing or storage uses or any combination of such uses, and partly for any other uses set forth in the table in Section 44-52 (Required Accessory Off-street Loading Berths), at least 50 percent of the floor area in the building shall be subject to the requirements set forth for wholesale, manufacturing or storage uses, and the remainder shall be subject to the other applicable requirements.