Authorizing the revision of lines and grades on a portion of City Plan No.178 by striking from the City Plan and vacating Clarkson avenue from Wister street to Twenty-first street; by reserving and placing on the City Plan a right-of-way for drainage purposes, water main purposes and public utility purposes within the bed of Clarkson avenue; and by striking from the City Plan Twenty-first street from Belfield avenue to Clarkson avenue, all under certain terms and conditions. — Open Common Ground