Rettew Associates approached Professional Design & Construction, LLC in 1997 to design and construct a new 18,000 square foot, three-story office building for their fast-growing company. As their firm continued to grow, they approached Professional Design & Construction, LLC again to design and construct a new four-story addition to their facility.  The structure provides 20,700 square feet of additional office space for administration and the expanding engineering staff which features a large conference room with advanced telecommunications networking equipment. The fourth floor houses their Information Technology suite to service this office, as well as other company locations.