Building maintenance is gaining an increasing worldwide recognition in many fields of study.as a result; a remarkable shift in building maintenance management from preventive approach to predictive approach is taking a place now a days. That is achievable through building of an evaluative model to assess a variety of alternative decisions and make the right decisions, taking in the consideration building condition and the available budget for maintenance. In Syria, there is lack of effective building maintenance for governmental buildings because we use an approach depends on doing the work after the fault happened, that leads to deteriorating in the all building's parts. In this paper, we study maintenance reasons and importance degree for every single components by designing questionnaire, divide the building in to its essential parts and components, and link them to maintenance works. At the end, we get mathematical models called deterioration models assist in predictable maintenance works and distributing the budget, and to make sure about validity of these models we apply them in the dormitory in Tishreen University.