Real estate giant CBRE has purchased a fast-growing Columbus-based tech company with 550 employees. CBRE Group announced Tuesday that it has acquired FacilitySource LLC from private equity firm Warburg Pincus in a $290 million cash deal. FacilitySource develops software that helps large landlords with procurement and facilities management services. "We are constantly evolving and extending our service offerings with innovative solutions," Bill Concannon, president and CEO of CBRE's Global...