In former time Thailand was completely an agriculture country. Bangkok which functioned as a capital and port city was very small. Prior to World War II, there was no such thing as a slum problem. The clustering of the ordinary people in make-shift thatch-roof dwellings was not considered a problem to the city. Although from time some of them were evicted or removed to pave way for the construction of public infrastructure or commercial development, it was not a big deal. For example, the location of the existing half-a-century old commercial buildings along Rachadamnoen Klang Avenue was formerly inhabited by the ordinary people in the form of “slums”