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In the districts indicated, except as otherwise specifically provided in the Use Groups permitted in such districts and in Sections 36-11 (General Provisions) and 36-61 (Permitted Accessory Off-street Loading Berths), all permitted uses which are created by development, or which are enlarged or extended, or which result from a change of use shall be subject to the provisions of this Section with respect to enclosure within buildings. With respect to the enlargement or extension of an existing use, such provisions shall apply to the enlarged or extended portion of such use.

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.