The Old Executive Office Building, originally called the State, War, Navy Building, is a national historic landmark which houses the Executive Office of the President of the United States. Constructed between 1871 and 1888, the building is one of the nation's finest examples of French Second Empire Style.

The project involved total removal of the existing standing and flat seam copper roofing and rehabilitation of the entire structural roof deck. Over 65,000 sq. ft. of new, custom-fabricated standing and flat seam copper roofing was installed and 40,000 sq. ft. of slate roofing was restored. Additional restoration work included rehabilitation of all cast iron hip rolls, cornices, balustrades, scroll work and dormers, including 25 ornate chimneys and multiple complex skylight installations. The work required utilization of a tower crane, set on a cast-in-place concrete foundation and equipped with a 200 foot boom, and erection of 130,000 sq. ft. of scaffolding around the building perimeter. The $25 million historic restoration was accomplished in five construction phases over a 42 month period, while the building remained fully occupied.

As the project involved removal and replacement of much of the structural roof deck, demolition of the roof deck was followed by the construction of forms and cast-in-place concrete. Concrete required curing over a seven day period; and thus, the entire system was maintained watertight throughout the period of construction. Access to the project was extremely limited and could only occur through the hoisting, by tower crane, of materials from 17th Street. Pedestrian protection and signage was also critical for crowd control.