Amending Section 2 of an Ordinance (Bill No. 990713) approved December 21, 1999, entitled "An Ordinance authorizing the revision of lines and grades on a portion of City Plan No. 42 by striking from the City Plan and vacating the legally open portions of Thirty-second street from Market street to Chestnut street and by reserving and placing on the City Plan a right-of-way for drainage purposes, water main purposes, gas main purposes and public utility purposes within the lines of Thirty-second street being stricken from the City Plan and vacated under authority of this Ordinance, under certain — Open Common Ground