we are building a house in gwinnett county, georgia. the property in the subdivision is zoned r-140. the subdivision is 25 years old. when it was first zoned, the setback was 65' from the front property line. in 1986 it was changed to 35'. we obtained a permit with the current setbacks (35'). we have laid the foundation - walls and slab. our neighbor is now sueing us for infringing on the building line. do we have any options other than giving in?