1. Most of the houses in a neighbourhood were built within relatively short time period. There is no enough time span that allows you to see the difference.
2. There are so many other factors that both buyer and seller weigh heavily when determine the price, including housing physical quality, social composition, market trend, and etc.
3. The value of a house consists of two portions: the value of the house itself and the value of the land. While housing physical condition deteriorates over time, the land value increases. The same $300,000 house in Toronto may worth 1/3 of it in remote rural area. The difference is due entirely to the variation of places (or the location of the land). It is difficult enough to just differentiate these two portions.
2. There are so many other factors that both buyer and seller weigh heavily when determine the price, including housing physical quality, social composition, market trend, and etc.
3. The value of a house consists of two portions: the value of the house itself and the value of the land. While housing physical condition deteriorates over time, the land value increases. The same $300,000 house in Toronto may worth 1/3 of it in remote rural area. The difference is due entirely to the variation of places (or the location of the land). It is difficult enough to just differentiate these two portions.