Signs that were legally installed prior to the effective date of this chapter, but are inconsistent with the requirements of this chapter, are considered legal nonconforming uses, and are "grandfathered" by this chapter. As such, they may continue to exist; provided, that they shall not be altered, modified, or changed in any way that would increase their nonconformity. When such modification, alteration, or change occurs or is proposed the sign shall be brought into compliance with this chapter. (Ord. 3, Series 2019)