Park Inn Berlin
The Park Inn Berlin is the tallest building and the eleventh tallest structure in Berlin and the 29th tallest building and tallest hotel-only building in Germany. The 37-floor high-rise is in the northeast of Alexanderplatz in the central Mitte district and has a height of 125 meters (410 feet).

The complex was built from 1967 to 1970 in the course of the redevelopment of Alexanderplatz when it was located in East Berlin. It was designed by the team of Roland Korn, Heinz Scharlipp and Hans Erich Bogatzky. However, the design as built differs in the shape and location of the tower on the lot from that envisaged in the 1964 plan for redevelopment of the square. The hotel opened as the Hotel Stadt Berlin, part of East Germany's Interhotel chain. It was a four-star hotel and mainly served for the accommodation of Comecon representatives. There was a panorama restaurant on the 37th floor and unusually fast elevators for the time and place. In 1993, after German reunification, it was renamed Forum Hotel Berlin, and after its acquisition by the Rezidor Hotel Group in 2003, Park Inn Berlin-Alexanderplatz. A casino, the highest in Europe, is now located in the restaurant. There is a public viewing platform on the roof. All the rooms were refurbished starting in 2001 at a cost of € 20 million. Between May and November 2005 the entire 15,000 sq m façade was replaced; the 6,800 new mirror glass panes cost € 3 million. In October 2006, two 35 m (115 ft) antenna masts were erected on the roof, bringing the total height of the building to 149.5 m (490 ft). In December 2006 the hotel and the attached real estate parcels were acquired by Blackstone Group.

Base building
The base of the tower rises from a three-story commercial building that houses a Burger King, an ice cream parlor, and some small stores. The top floor offers direct access to the adjacent Galeria-Kaufhof. For 15 years, the ground floor and basement levels housed a large Saturn electronics store (like Galeria-Kaufhof, a division of Metro AG), but in March 2009 this relocated to a new nearby mall called die mitte. The future of the hotel and especially the base building are uncertain; plans to rebuild Alexanderplatz drawn up in the early 1990s envisage demolition of the hotel or at a minimum of the base building to enable erection of 3 new high-rises.