Tp3 Architekten is an architectural practice and general planner based in Linz, Austria, founded in 2005 by Andreas Henter and Markus Rabengruber. The firm has many years of experience in the restoration, conservation, and adaptive reuse of historic buildings. A key reference project is the phased renovation of the Reichenau Castle Ruins, realized since 2004, in which a medieval ruin complex was stabilized through careful conservation and architectural interventions and opened up for contemporary cultural use.