Reporting non-compliant businesses

Anyone know how?
Business was opened by our mayor, he was also very rude to me about it.
It is a restaurant that was converted from a clothing store, so the architect knew, the engineers knew, the workers knew, the city inspector passed it and the fire chief passed it.
Has changed hands since (it is about a year old), so that means another set of inspections that were "passed".
I am sick of this and want to do something about it.
It is not a historical building and all they had to do was knock down the step (11") and make a ramp out of it.
I am thinking about making one of the old "Whites Only" signs and crossing out the Whites and painting Able-Bodied over it and gluing it to their window with gorilla glue.