Openplus have proposed a socially sustainable architecture and programme for Mapo oil reserve tank and its parking lot space. Mapo oil reserve tanks have been abandoned for more than 10 years but they are surrounded by beautiful nature and located in the state-of-the-art city, Mapo of Seoul. Instead of filling the space with programme and construction, Openplus proposed an art MADANG (open space) and art TANKs that will be filled and developed by local artists by leaving the site half empty. Instead, transformed topography and laid-out “service pole” was proposed as infrastructure to enable various size and shape of artist studios at Madang, and “service ring” was proposed as supporting space to enable tank to contain flexible programme in Tanks. Mapo Art Madang, Mapo Art Tank will be built by user themselves amd will build its unique character over time.