in april 2004, ivg acquired 50.1 percent of oppenheim real estate investment company ltd. (oic) and, in 2005, ivg acquired 33 gas storage caverns owned by the federal republic of germany in etzel, near wilhelmshaven. ivg's interest in oic increased to 94 percent in 2006/2007 and oic was renamed ivg institutional funds gmbh and integrated into the former ivg funds.