53 Pa. Stat. § 30660
In addition to the powers heretofore granted to cities of the second class as provided for in an act, entitled "A supplement to an act, entitled 'An act for the government of cities of the second class,' approved the seventh day of March, one thousand nine hundred and one; authorizing cities of the second class to regulate and limit the height and bulk of buildings and the area of yards, courts and open spaces, and to regulate and restrict the location of trades and industries, and the location of buildings for specified uses, and to make regulations for trades and industries and for the use of buildings; and, for the above purposes, to divide the cities into districts; and authorizing the city planning commission to recommend the boundaries of districts and appropriate regulations therein; and providing the method of adoption of said districts, regulations and restrictions, and the method of amendment or change thereof," approved the twenty-first day of June, Anno Domini one thousand nine hundred and nineteen (Pamphlet Laws, five hundred seventy), as amended by an act, approved the eleventh day of May, one thousand nine hundred and twenty-one (Pamphlet Laws, five hundred and three), entitled "An act amending an act, entitled 'A supplement to an act, entitled "An act for the government of cities of the second class," approved the seventh day of March, one thousand nine hundred and one; authorizing cities of the second class to regulate and limit the height and bulk of buildings and the area of yards, courts and open spaces, and to regulate and restrict the location of trades and industries, and the location of buildings for specified uses; and to make regulations for trades and industries and for the use of buildings; and, for the above purposes, to divide the cities into districts; and authorizing the city planning commission to recommend the boundaries of districts and appropriate regulations therein; and providing the method of adoption of said districts, regulations, and restrictions, and the method of amendment or change thereof,' approved the twenty-first day of June, Anno Domini one thousand nine hundred and nineteen (Pamphlet Laws, five hundred seventy); providing for twenty days' notice to the city planning commission of any proposed amendment or change, for an enforcing officer, and a board of appeal to review his actions," the mayor of every city of the second class shall, with the approval of the council, appoint a board of appeals, consisting of three members--one of whom shall be a member of the planning commission--one of whom shall be designated to serve until the first day of January, one thousand nine hundred and twenty-four, one until the first day of January, one thousand nine hundred and twenty-five, and one until the first day of January, one thousand nine hundred and twenty-six. Their successors shall be appointed on the expiration of their respective terms to serve three years.
53 P.S. § 30660