By Frieder Plümel (P Studio)
More and more people are living in cities. Therefore we need to make them more dense and sustainable. One of the most efficient methods is to build wooden structures on top of existing buildings. This project suggests to use the "haus der statistik" at the berlin alexanderplatz as plinth for two over 30 storey high wooden towers. These are connected by a public bridge, with functions as leisure, gastronomy and park space. The currently abandoned building should be renovated and again be used as office space with retail at street level. In order to build as high and dense as possible and to maximize the floor space, the structure is simple, modular and relates to the current building. Additionally there are many balconies which are extraordinarily long and can be used as green house for urban farming, as garden in the sky or simply as an additional living space. Wood is the main building material with all its advantages like little weight, low costs, sustainability, great haptic and visual appearance. On top of the towers forming trees a green city crown and invite the public to take a look at berlin. The different living units are stuck through the tower so that there is always light from two directions and at least one balcony. The very flexible basic structure allows a wide variety of unit types and can attract a very diverse group of users. On top of the cores serving solar panels for energy independence. The overall impression of the two tower will be the contrasting and dissolving of the reduced and elegant plinths into an open, transparent and sculptural green living space, bringing nature in the city sky.