'Maintaining' a builing involves numerous tasks to be carried out especially with older structures this can be more involving. As human nature dicates that looking after possessions is a way of life from where maintaining properties seems to have derived. Property maintenance not only involves the day to day cleaning, which is pretty standard practice (although can become quite intricate when taking on other tasks) but also maintaining the Air conditioning, Water purifier, Plumbing, Electrical wiring, refurbishment, redesign, or construction of buildings.