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This Section shall apply to existing buildings in which the number of dwelling units is increased as well as to all new development.

Any given floor area shall be counted only once in meeting the floor area requirements.

In all districts, as indicated, the floor area requirement per dwelling unit shall not be less than as set forth in this Section, except as provided in Sections 23-24 (Special Provisions for Buildings Containing Multiple Uses) or Section 23-25 (Special Provisions for Existing Small Zoning Lots).