CoStar expanded into the single-family housing market through an investment in Homes.com. - Alamy Hedge fund D.E. Shaw is pushing for a board shake-up and other big changes at CoStar Group, a major commercial real-estate information provider that is already facing pressure from Third Point. The details D.E. Shaw believes CoStar’s shares have underperformed because of its “high-risk, money-losing” investment in Homes.com, a consumer-facing platform that aggregates home listings, according to a letter to ...