Any sexually oriented business lawfully operating on the effective date of this ordinance, that registers with the director of planning as a nonconforming use, by filing an application with the chief of police for a license prior to November 1, 1996, and that is in violation of subsections (a), (b) or (c) of this section, or in violation of use schedule 14-2-2.4, shall be deemed a nonconforming use and it shall not be an offense under subsections (a), (b), or (c), of this section which such nonconforming status is in effect. The nonconforming use will be permitted to continue unless terminated or abandoned for any reason or voluntarily discontinued for a period of six (6) months or more. Any nonconforming use which is discontinued or which remains vacant for a period of six (6) months shall be considered to have been abandoned. Such nonconforming use shall not be increased, enlarged, extended or altered except that the use may be changed to a conforming use. If two (2) or more sexually oriented businesses are within 1,000 feet of one another and otherwise in a permissible location, the sexually oriented business which was first established and continually operating at a particular location is the conforming use and the later-established business(es) is nonconforming.