Any use established or changed to, and any building, structure or tract of land developed,
constructed or used for, any permitted or permissible principal or accessory use in
any zone shall comply with all of the performance standards set forth in this subdivision
for the district involved, excluding modes of transportation (e.g. airports, railroads,
etc.). If any existing use of a building or other structure is extended, enlarged
or reconstructed, the performance standards for the district involved shall apply
with respect to such extended, enlarged or reconstructed portions of such use of the
building or other structure. Existing premises accommodating changes in use, as defined
in section 62-2801, shall be subject to compliance with all requirements of article VI, division 6,
subdivision III setting forth performance standards.
