Since 1996, Data Concept, operating under the domain name www.immowelt.de, has run an online property website with the largest selection of advertised property in Germany. The site is financed through property advertisements and usage fees for estate agents.
In March 2000, Immowelt was relaunched to become a portal "all about buying property", offering users free information, tips and addresses concerning building, dwelling and finance. This was complemented by providing information regarding events and vacancies in the property business. Immonet is currently one of the top-3 property portals in Germany.
In 2003, the Immowelt AG was bought by a cooperation of local newspapers (ISA KG) and became the hub of their online classified advertising business.
