LINCOLNSHIRE, ILL. — Principal Real Estate Investors has sold Tri-State International Office Center in Lincolnshire, a northern suburb of Chicago. The Class A office park spans five buildings and 559,204 square feet. The buildings are 79.3 percent leased to tenants such as CDW Corp., LTD Commodities, Solo Cup and Wells Fargo Bank NA. CDW, a computer hardware and software company, occupies two buildings at the property for its corporate headquarters. Amenities include a conference center, 135-seat auditorium, fitness center and deli. Patrick Shields, Bryan Rosenberg, Jaime Fink, Jeff Bramson and Mark Katz of HFF represented Principal Real Estate Investors. The investment arm of real estate brokerage Bradford Allen purchased the property for $75 million, according to Crain’s Chicago Business.