Slum dwellers of the new millennium are a sixth of the world?s population and will likely grow to 1,5 billion by 2020. Recent years have seen a dramatic growth in the number of slums, as urban populations have increased, in the Third World and in particular in India where the number of people living in slums has more than doubled in the past two decades and now exceeds the entire population of Britain. India?s largest slum population is in Mumbay, the country?s financial and film capital, where an estimated 6.5 million people? at least half the city?s residents ? live in tiny makeshift shacks surrounded by open sewers. Within the Colaba districts, the art centre of Mumbai, is located one of the slums in Mumbay. The city area is saturated and there is very little scope presently for new development. Slum rehabilitation need to be undertaken on priority. The idea is not only to provide inexpensive housing units to slum dwellers in the same area they used to live, but also to keep up social cohesion, to stimulate economy process, to give educational and sanitation facilities, to grant food growing garden to each housing unit and open green areas for the new skyscraper community.