No lot which conforms to the requirements of the zoning ordinances of the Borough governing minimum lot width, depth, area or setbacks shall be considered to be nonconforming where such nonconformity was created solely as a result of a dedication of land to the Borough, the County, the State or any other governmental agency or authority for a sewerage, drainage or road widening project, provided that the remaining property is not less than 80% of the requirements of the zoning ordinances.