De Baarsjes in Amsterdam is a multicultural neighborhood that is home to people from 129 different countries. Because living with different cultures in one neighborhood is not always easy, the city district wanted to boost community life. The city came up with the idea to transform an open air swimming pool into a building which combines swimming pools, a therapy pool, fitness, aerobics, sauna and steam bath, a party center, café and childcare. A KFC fast food restaurant was added to create low education jobs for the unemployed. Each individual element of this complex was meant to attract different target groups, so the entire population would be able to use it in the end. An extra design challenge was to create an invisible green building because people from the neighborhood wanted to keep the green character of the area.

The building was designed as a city – a society in miniature – inside a cave. The building is full of lines of sight and keyholes that offer perspectives on the various visitors, activities and cultures in the building. Sunlight penetrates deep into the building’s interior through all sorts of openings in the roof. Low windows frame the view of the street and the sun terrace. People can enjoy the facilities they came for, but they can also see many other activities, intriguing their interest and inspiring them to use these as well.

Today, with its green façades and roof, Sportplaza Mercator marks the start and end of the Rembrandtpark. From a distance, it seems like an overgrown fortress flanking and protecting the entrance to the 19th-century city. Glimpsed through the glass façade, a modern spa-style complex glistens, complete with swimming pools, fitness space, and restaurant and party facilities. The entrance is the departure hall that everyone uses and from which all can reach their destination.