While, generally speaking, Bern is growing at a moderate pace, there are several urban development hot spots, as Jeanette Beck, head of the urban planning office, explains in an interview. New districts like Viererfeld are the visible results of a lengthy urban planning process that was at times a subject of controversy, industrial and commercial districts have been reinterpreted and enriched with housing. For Weyermannshaus West the office of Rolf Mühlethaler developed a concept that is based on the phased development of the existing building stock. Wankdorf City 3, a mixed-use site in the north of the city with a very high density, is already under construction. There are also other challenges: how to improve the quality of Bern-East through which the corridor of the A6 motorway cuts a swathe? If the Bypass Bern-East tunnel project does not come to fruition what possibilities remain? Collaboration with neighboring municipalities is important.