A vertical metal-sheet house

I had observed a unique phenomenon of metal sheet houses in Taichung. Unlike other Asian cities, metal sheet houses are combining living and business in Taichung, not just built for residential use. I try to find the causes behind such a special building type. The urban lands have been constantly subdivided over time when they were inherited or new roads were laid out. Therefore, how to make the best of these fragmented urban lands for profits before they are re-planned become critical for house owners in Taichung. This also results in the unique building types of Taichung.