Sparkasse Hagen Tower

Construction began 1 August 1972 and finished on 29 November 1975. It was inaugurated on 29 November 1975. It was named after the director of the savings bank at that time, Oskar Specht. The architect of the building was Karl-Heinz Zernikow from Hagen. The cultivated surface amounted to the effective area (office surface: . The building had 22 storeys, of it 2 basements, the building height over the upper edge of the area was , the building length of , the building width approximately . The front consisted of a pre-hung aluminum construction with a surface of . The converted area amounted to . A characteristic was the constant reinforced concrete slab, which served the balance of the building for the elevator pits: , and thick. Water leakage penetrated, and damaged building insulation. Repairs would have required further measures, including improvements to the air conditioning system and installation of a second stairway for fire safety reasons. Repair costs were estimated at €42 million. It was estimated that demolition would cost 5 million euro and construction of a new building would cost €16.8 million. Therefore, it was decided to demolish the current building and construct a new one. ==Demolition==

The building was explosively imploded at 10:53 on 7 March 2004, in the then-largest and riskiest breakup of a multistoried building in Europe. 1,450 explosive charges weighing 250 kilograms were used in timed sequence to cause 26,000 tons concrete and steel to first fold and then collapse into a predetermined bed without damaging neighboring structures. The successful breakup is considered as master achievement of the specialty firm from Thuringia and receives an entry in the Guinness World Records. Langer Oskar (Vorne).png|Layout of the original building's narrow side Sprengung des Langen Oskar.jpg|Implosion on 7 March 2004 Oscar 01.jpg|The building's place one week after the implosion ==References==