Dallas-based real estate investor Quadrant Investment Properties closed on a purchase of the Union Bower Business Park in southeast Irving in mid-July. Quadrant will repaint, repair and provide landscaping to the 302,848 square-foot industrial park. The aging six-building park was built in 1986 and saw more construction in 1996. It is at 83-percent occupancy with office, manufacturing and distributing tenants. The Union Bower Business Park is located at 303 Union Bower Court.