Dwight D. Eisenhower Executive Office Building Modernization in Washington, D.C.

Dwight D. Eisenhower Executive Office Building Modernization



Thornton Tomasetti provided structural services in support of the phased modernization of this second empire-style building. Located adjacent to the White House, it consists of approximately 600,000 square feet and houses agencies and staff serving the executive branch of the United States government. Originally constructed between 1871 and 1888, it is registered as a category one national historic landmark.

We performed structural design and construction administration for Design Increment Number One, which included fire/life safety improvements and an electrical upgrade. Work included new egress stairs and fire doors. This project was designed in metric only – drawing specifications and calculations – all according to GSA standards.

We completed bridging documents for modernization of the 17th Street Wing (Phase One), State Place Wing (Phase Two) and Pennsylvania Avenue Wing (Phase Three) design-build increments. The need to thread modern systems into a masonry building, concealing new equipment within the historic structure, posed a challenge to designers. These phases also included the design of framing for ballistic and blast-mitigation windows.

In 1997, as a member of a design-build team, an operations center was designed and completed. Significant new structural framing, as well as evaluation of the existing structural framing posed considerable challenges due to the historic nature of the building.

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