An Act amending the act of September 28, 1965 (P.L.543, No.282), entitled, "An act authorizing incorporated towns to adopt and enforce zoning ordinances regulating the location, construction, and use of buildings, the size of courts and open spaces, the density of population, and the use of land," authorizing boards of adjustment to deny applications if applicant has a tax delinquency or housing violation relating to real property.