臺北市近年房價高漲，產生對於建築物需求的增加。本研究由實證的角度，了解建築物生命週期，以及決定其經濟壽命的主要因素。這不僅增加對於事實的了解，也可以據此預測未來建築物的經濟壽命或是存活期間。我們透過建管單位的建築物拆除和使用執照存根，逐步勾勒出臺北市建築物生命週期，以及建築物壽命與都市發展間的複雜關係。空間分析以及回歸模型得到以下發現：一、臺北市建築物新建速度高於建築物拆除速度。二、臺北市建築物重開發出現地方空間聚集現象。三、戶口數變動對於臺北市建築物重開發之影響較人口數變動重要。四、新增建築供給集中於高房價地區。 The soaring housing price in Taipei city over the recent years has led to the need for more new buildings. This study takes an empirical approach to understanding the economic life of buildings and the underlying determinants. This approach not only improves our understanding of the life cycle of buildings but also the capability of planning for the future development of the city. Analysis of the records of permits to build and demolish buildings has led to the following conclusions. First, the demolished floor spaces over the years of 2001 through 2009 have been over-replaced. The net floor spaces are on a rise. Second, the new buildings have occurred in certain locations with a clustering pattern. Third, it is the number of households not the number of population that matters to the formation of new buildings. Finally, the new buildings tend to appear in areas with a high housing price.