53 Pa. Stat. § 1862
Whenever the center line of any highway constitutes the dividing line between a city and a borough, or a city and a township of the first class, or a borough and a township of the first class, located in the same county, the council of such city, borough and the board of commissioners of such township may, where such improvement is through built up property or properties duly plotted and laid out in lots for building purposes, and where two-thirds of the combined frontage of the two sides petition for the improvement, enter into a contract providing for the grading, curbing, draining, paving and/or macadamizing of such highway. Such alterations and improvements shall be made under the supervision of the proper authorities of such city, borough or township, or by contract let by such city, borough or township, as may be provided for in the contract between the city and township.
53 P.S. § 1862