. "high density living" . "large panel system" . "panel building system" . "tower block" . . . . "Plattenbau" . "Large Panel System" . . "panel building" . "prefabricated concrete structures" . . "apartment blocks" . "large structural slabs" . "concrete tenements" . "large panel system building" . . "pre-fabricated apartment buildings" . . "Panel System" . . . "plattenbau-style" . "communist-style" . "plattenbau" . . . . "panel buildings" . . "apartment buildings" . "residential buildings" . "apartment blocks of urban type" . "industrial housebuilding segment" . "Plattenbau" . . .