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In all districts, as indicated, all commercial or manufacturing activities established by development, enlargement, extension or change of use, except storage of materials or products, shall be subject to the provisions of this Section with respect to enclosure, except as otherwise specifically provided in the Use Groups permitted in the district, and in Sections 44-11 (General Provisions) and 44-51 (Permitted Accessory Off-street Loading Berths). With respect to the enlargement or extension of an existing use, such provisions shall apply to the enlarged or extended portion of such use. The storage of materials or products shall be subject to the provisions of Section 42-52 (Enclosure of Screening or Storage).

Accessory uses may be open or enclosed, notwithstanding any limitations on the principal use, provided that any open accessory uses are customarily found in connection with such principal use.