53 Pa. Stat. § 16664
If any person shall lay the foundation, or begin to lay the foundation of any party wall, or of any wall adjoining or upon the line of any public street, lane or alley, within the said city, before the line and boundaries of the lot or piece of land whereon the said foundation shall be so laid, or begun to be laid, shall be adjusted and marked out by the said regulators, or two of them, every such person, as well employer as master builder, shall forfeit the sum of ten pounds, one half part thereof to the street commissioners for the time being, to be laid out towards making or amending the pavements of the public streets, and the other half thereof to the use of the informer, together with costs: Provided, The prosecution be commenced in the city of Philadelphia, and within twelve calendar months after the offense shall be committed.
53 P.S. § 16664