A. General. All support structures which existed prior to the adoption date of this UDO, and which do not meet the requirements of this Section, shall be permitted to continue as legal non-conforming structures, but shall not be modified except in accordance with this Section.
B. Modification. Minor modifications, including ordinary maintenance performed on a nonconforming wireless facility or support structure, may be permitted so long such maintenance does not represent a Substantial Modification (as defined in this Section).
a. Substantial Modifications shall require a zoning permit, per Section 3.4.20: Zoning Permit, and approval by the Director.
b. An Eligible Facilities Request (as defined in this Section) shall not constitute a Substantial Modification and shall be approved by the City, per G.S. § 160D-934.
c. Collocation of wireless telecommunications facilities on an existing nonconforming wireless support structure shall not constitute a Substantial Modification, but shall be reviewed and approved in accordance with the site and development plan process as stated in Section 3.4.17. Qualified collocation applications can be reviewed for conformance with site plan and building permit requirements, but are not otherwise subject to zoning requirements.