Amending Chapter 19-1800 of The Philadelphia Code, entitled "School Tax Authorization," by providing that real estate taxes imposed by the Board of Education of the School District of Philadelphia for tax year 2003 and thereafter shall be based upon the assessed value of real estate as certified by the Board of Revision of Taxes in 2001, thereby freezing such taxes at the level imposed for tax year 2002, and by requiring that any other real estate taxes imposed by the Board of Education be based upon such assessed values, all under certain terms and conditions. — Open Common Ground