site. These costs were defrayed jointly by both the federal government and the federal state of Berlin, each contributing 50%. The architects estimated construction costs at a maximum of €20 million and a construction period of two years. The construction was finished on time and the new building was opened to the public on 7 May 2010. Building The open-air exhibition in the trench alongside the excavated segments of cellar wall on Niederkirchnerstraße (formerly Prinz-Albrecht-Straße) was retained and sheltered with glass. The room for the permanent exhibition is 800 cubic metres and presents the development and functions of the security apparatuses during the Nazi regime. A room for events at the back of the building can accommodate 200 participants. In the southern part of the area outside is a copse of black locust trees, the remains of "Harrys Autodrom" from the 1970s, whereas the rest of the open space is covered with greywacke. Around the flat-roofed building is a façade made of metal lamellae, which opens the building in a way that it is possible to look out of it to the surroundings anywhere on the ground floor of the building. In the basement is the seminar centre, the library with about 25,000 volumes, the memorial department and offices for 17 employees of the Topography of Terror Foundation. Exhibitions Permanent exhibitions With the inauguration of the new Documentation Centre, three permanent exhibitions are open to the public. All three are presented bilingually in German and English. Topography of Terror. Gestapo, SS, and Reich Security Main Office on Wilhelm- and Prinz-Albrecht-Straße The "Topography of Terror" permanent exhibition was shown in the open air until the new Documentation Centre opened. The thoroughly revised and redesigned "Topography of Terror" permanent exhibition is presented over 800 square meters in the new building. The focus of the exhibition is the central institutions of the SS and police in the "Third Reich" as well as the crimes they perpetrated throughout Europe. Attention to the Nazi regime's many victim groups will assume a central place alongside the portrayal of the system of terror. Berlin 1933–1945 Between Propaganda and Terror A permanent exhibition about the capital Berlin during the "Third Reich" will be on display in the exhibition trench alongside the excavated segments of cellar wall on Niederkirchnerstraße (formerly Prinz-Albrecht-Straße). It will address National Socialist policy in Berlin and its consequences for the city and its population. Topography