If it was known that the fence was constructed 4 years ago, why was no action taken then??? You could possibly issue a notice of violation for construction without a permit but, what good would that do. When the applicant came in to apply for a permit none would be required. Again if it was known that the fence was constructed 4 years ago, why was no action taken then, there are time limitations on this type of issue and it starts from date of discovery
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