FM (facilities management) is a relatively new and fast developing profession in the service industry. The quality of FM service plays an important role in the overall service performance of shopping mall. This study empirically investigates the relationships between overall perceived customer satisfaction and satisfaction concerning nine FM service dimensions with a five-year longitudinal survey, which aims to reveal how the variations of the overall satisfaction can be attributed to different variations in the satisfaction of each specific dimension. It is worth noting that the average customer satisfaction scores increase continuously from 3.85 (2006) to 4.05 (2010) with an annual growth rate of 2.94 per cent. This result suggests that the FM companies are successful in fulfilling clients’ satisfaction, which is crucial for service based business. In addition, we identify that FM service dimensions contributing to OPMS change over the years. We also identify several critical dimensions to which the overall customer satisfaction of FM service is sensitive. These results imply that FM providers could effectively improve customer overall satisfaction by enhancing the satisfaction level of those critical dimensions.