C. Nonconforming Uses
Nonconforming uses of land, buildings, or structures are subject to the following additional limitations:
(1) Limitations on Continuation of Nonconforming Uses
a. A nonconforming use may be extended throughout the same building or structure; provided, that:
1. No structural alteration of the building (or portion of such building containing the nonconforming use in the case of buildings with multiple uses) shall be permitted;
2. No additional dwelling units shall be permitted in the building;
3. No additional nonresidential units and/or uses shall be permitted; and
4. Such extension would not result in additional required parking pursuant to Section 5.5.D, Minimum Off-Street Parking Spaces Required.
b. Any existing occupied single-family residential dwelling that is deemed to be a nonconforming use may make improvements to the main and accessory structures so long as improvements do not increase the degree of nonconformity or increase the height or building footprint.
c. No additional structure not conforming to the requirements of this Code shall be erected in connection with the nonconforming use of land or structure.
d. Whenever a nonconforming use of land or a building has been discontinued for a period of six months, future use of land or building shall comply with this Code. The Director may grant an extension if improvements that are necessary for the continuation of the nonconforming use are diligently pursued.
(2) Change of Use
a. A nonconforming use that has been changed to a less nonconforming use pursuant to this subsection may not subsequently be changed back to a more nonconforming use.
b. A nonconforming use, if changed to a conforming use, may not subsequently be changed back to any nonconforming use unless otherwise permitted by this Code.