Petite Ceinture

The Phobia Skyscraper is a new form of modular suburban residential development for Paris, France. It is located over the “Petite Ceinture”, a former industrial site with excellent views of the city and an extensive transportation network. Two main ground slabs and an empty tower structure, constructed of recycled industrial materials, hold prefabricated units that are stacked to utilize the same plumbing system but are rotated to open to outdoor spaces. The units are grouped around outdoor common green spaces.
http://www.evolo.us/featured/phobia-skyscraper-revitalizes-paris-suburbs/