Amending Subcode "PM" of Title 4 of The Philadelphia Code, entitled "The Philadelphia Property Maintenance Code," by requiring owners of vacant lots and vacant buildings to post a bond or other security for the City's potential cost of correcting Code violations or abating unsafe or imminently dangerous conditions when authorized law; providing that failure to post such security will result in suspension of the vacant property license and all other licenses issued to such person under the Property Maintenance Code, including residential rental property licenses, multiple-family dwelling licens — Open Common Ground