The onOffice software company in Aachen was established in 2001 as a sole proprietorship. It was converted into an AG (Arbeitsgemeinschaft, engl.: joint venture) in 2014. Later, in September 2015 the company expanded and inaugurated a second branch in Vienna, Austria. Up to today, about 12,000 users benefitted from the onOffice Real Estate software,

Executive Manager Stefan Mantl is head of the onOffice team counting more than 140 experts. onOffice cooperates with Real Estate agents, bank institutes, and Real Estate networks, as well as house manufacturers. The second pillar of onOffice comprises the conception and implementation of Real Estate websites as well as related digital means based on the inhouse content Management System.