16 Pa. Stat. § 9854.2
During the four-year period beginning with the day of the first such entry in accordance with an ordinance adopted under section 1.1 of the act of April 22, 1929 (P.L. 620, No. 258), entitled "An act directing the recorder of deeds of each county of the Commonwealth to refuse for record all deeds or other transfers of real estate, or interest in real estate, unless a certificate is attached to said instruments giving the precise residence of the grantee or grantees named therein; and requiring a list thereof to be delivered to the proper board of revision of taxes, or other officials charged with the assessment of real estate," the recorder of deeds or commissioner of records shall continue to arrange such indexes alphabetically; but the recorder or commissioner shall also maintain an additional separate set of indexes of deeds, mortgages and other instruments affecting real estate or interest in real estate arranged by the uniform parcel identifiers to facilitate easy reference to such instruments. During such four-year period, this separate set of indexes arranged by uniform parcel identifiers shall be merely for the convenience of the public and shall not constitute notice or the lack thereof. At the end of the four-year period or such later period as may be established by such ordinance and thereafter, both the alphabetical indexes and the indexes arranged by the uniform parcel identifiers shall constitute notice or the lack thereof for all deeds, mortgages or other instruments affecting real estate left for record with the recorder of deeds or commissioner of records on or after the date such indexes were originally established.
16 P.S. § 9854.2