Several government's building in Jakarta are in bad conditions. Maintenance policies have been made by the government in an effort to keep the performance of the building remain good. In implementing the policies that have been made, appropriate strategies are needed to enable the policy to proceed as planned. Although the budget was increased for maintenance activities, the implementation didn't go well as planned in government's building. This study aims to improve building functional performance by evaluating the maintenance policy and strategic implementation. Several method were adopted to identify policy, strategy and the factors of functional performance which affected through questionnaire survey and Delphi technique. The results should show that maintenance performance could be improved by evaluating the maintenance policy and its strategic implementation. The originality of this research could identify the factors in maintenance policies and strategies, which affect the functional performance of government buildings that necessary including security and environmental aspects which is not included in past research.