IBM is making its first purchase of 2011 today with acquisition of real estate management software developer Tririga. Financial terms of the deal, which is expected to close in the second quarter of 2011, were not disclosed. Tririga's software helps clients make strategic planning decisions regarding space usage, evaluate alternative real estate initiatives, generate higher returns from capital projects, and assess environmental impact investments. IBM says that property and real estate typically represents the second-largest expense on a company's income statement, after employee compensation. Tririga's software helps companies streamlines and cut these expenses.