Nonconforming Signs. A nonconforming sign shall not be altered, rebuilt, enlarged or extended. The right to maintain a flashing, blinking, fluctuating or animated sign shall terminate within 90 days after the sign becomes nonconforming. The failure to keep a nonconforming sign in good repair for a period of one year shall constitute an abandonment of the sign, and the sign shall be removed within ten days following the completion of that year. Any sign found not to have been legally erected and maintained as described above shall be removed within 30 days of notification of the violation to the sign owner and/or property owner, unless said sign conforms to the regulations as stated, in which case, the proper permit shall be obtained within 30 days of the violation.