Oosenbrugh Group is a family-run private-equity firm and single-family office headquartered in Olsberg, North Rhine-Westphalia, Germany. Its real-estate activity centers on residential and office properties, with particular attention to historic buildings and monuments. Through Sweetspot Immobilien, the group develops and maintains these properties; its The O’s project develops boarding houses and flexible temporary housing for professionals in the Sauerland. Its property work combines historic character with modern living concepts and hands-on property management. For real estate sponsors, its distinctive angle is family-office investment paired with direct property development and management, including the adaptation of historic buildings for modern living.