ISARIA Wohnbau AG is a holding company, which engages in the real estate business. It operates through the following segments: New Construction, Revitalisation, One Group, and Other. The New Construction segment purchases, develops, and manages residential properties. The Revitalisation segment operates under the APP.ARTMENTS brand which acquires and converts existing commercial properties to houses and apartments. The One Group segment provides financing services. The Other segment refers to rental income. The company was founded by Josef L. Kastenberger in 1995 and is headquartered in Munich, Germany.