Be sure of the properties that you intend to buy, sell or act upon as an agent to rent out. Make sure that all necessary documentation and building code requirements are complete and updated. Check the background of the property if it has been lived in before to make sure of any renovations they might have done. These might have unwittingly damaged the structural integrity of the said property. When buying old properties, those that are more than 50 years old check with city hall of the local historical society, if the said residence is qualified to be included in that particular area’s historic sites.