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It is difficult to compare and analyze real estate based on the gross value due to its heterogeneity. Both the general public and the real estate industry use unit price per floor area to compare and analyze the price differences between different types of buildings based on the individual factors or regional factors. However, the questions are whether there are comparable or substitute relationships of unit prices among different types of townhouses and condos with elevators, and whether there is a linear relationship between building age and unit price per floor area. Tainan City is one of the six special municipalities in Taiwan. Yet, its population has long stayed stable at around 1.88 million. Therefore, the amount of building land is comparatively more available, and the main types of buildings are low-density townhouses. Over the last 15 years, however, some types of condos have become increasingly available. Therefore, this study collected the data on real estate prices from 2015 to 2017 in three districts of Tainan City, namely North District, Anping District and East District, from the data set of “registering the actual selling price of real estate”, website of the Ministry of the Interior. Meanwhile, several special cases were excluded: houses with a ratio of floor area to land area lower than 2 (less than 95% of floor area ratio was used).Suites, apartments and stores were also excluded; houses aged over than 31 years old were also excluded. In other words, the study carried out comparisons and analyses of unit prices per floor area for the mainstream categories on the market. This study also divided the trading cases into six categories: townhouse stores (unmarked townhouse stores facing the road or street), townhouse residences, 5-10 stories condos, 11-15 stories condos with elevators, 16-20 stories condos with elevators, and 21-27 stories condos with elevators. In the meantime, the building age was categorized into six intervals. Descriptive statistics, cross analysis and regression analysis were used to analysis the differences between the unit prices among different real estate categories. The conclusions are summarized as follows: 1. In terms of districts, the unit prices ranked in descending order were respectively, East District, Anping District, and North District. East District was far more expensive than the other two districts, while North District was slightly less expensive than Anping District. 2. In terms of building category, the unit prices in descending order were respectively, townhouse stores, townhouse residences, condos of 16-20 stories with elevators, condos of 5-10 stories, condos of 11-15 stories with elevators, and condos of 21-27 stories with elevators. 3. In terms of building age, the houses between 11 and 25 years suffered the highest depreciation. Houses located in better regions suffer less depreciation. Houses with higher price could have less value depression. 4. There were approximately 3-5% of unit prices differences between the townhouse residences and condos with elevators (including those without elevators). The unit prices of townhouse residences were not much more expensive than thoseof condos, contrary to people’s general perception。
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