The number of building projects in Taiwan has rapidly increased each year, and the vacancy rate has reached a peak at 19.7%, an astonishing number. Therefore, this study examines the financial performance of property firms who execute building projects by calculating their Economic Value Added (EVA) and Economic Value Added Momentum (EVA Momentum). In addition, because numerous financial factors may affect EVA, this study examines how these factors influence the EVA of property firms to ascertain which factors are relevant. Furthermore, this study monitors the EVA of these firms to determine their relationship with the property cycle index to establish whether a causality exists between them.