germany-berlin: structures construction work./ bbz_lv08_carpentry interior doors./ construction of an extension to the bbz (vocational training center) chemistry, adlergestell 333, 12489 berlin. at the construction project it is a single storey construction extension building with classrooms for trainees in timber construction with a floor area or gfa of 241 m², a clear interior height of 2.65 m (suspended ceiling or 3.08 m (areas without a suspended ceiling) and one maximum building height (= top of highest point attica) from 3.84m.