The Firm was involved in this project during two separate stages. First, in 1979 - 1981 as a member of the GREDECO-NACO joint venture when the original Master Plan was prepared and second in 1996-1998 as a structural designer for various building assigned to the firm by HOCHTIEF AG concessionaire and contractor of the new Airport. In 1979 the Greek State awarded a contract to GREDECO, a Joint Venture of 3 Greek design firms and the Dutch firm NACO to review an existing old Master Plan and produce all designs necessary to construct a new International airport at Spata, northeast of Athens.

​

The new Master Plan was approved, the preliminary design of installations and infrastructure were finalized and a tender for earthworks was awarded to a contractor. Following the completion of most of the earthworks the work was halted for several years. It was resumed in 1996 when HOCHTIEF AG was awarded a concession to build and operate the new International Airport. HOCHTIEF contracted the preparation of structural designs and shop drawings for various buildings, including: The Air Traffic Control Building and Tower and the Buildings and Ground Equipment Maintenance Complex.