Allianz and Quest Investment Partners have jointly bought Überseehaus building. : Allianz Real Estate has acquired its first manage-to-core office asset in Germany in partnership with Quest Investment Partners. The real estate investors said they have acquired the 11,300sqm Überseehaus office and commercial building at Baumwall 5-7 in Hamburg for an undisclosed sum. Allianz Real Estate said it acquired the building on behalf of several Allianz insurance companies. Quest will take over the active asset and project management.