The Investment Building built in 1922 is an office building located at 1501 K Street

K Street (Washington, D.C.)

K Street is a major thoroughfare in the United States capital of Washington, D.C. known as a center for numerous think tanks, lobbyists, and advocacy groups.-Location:...

 NW Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

 Its main tenants include the Washington office of Sidley Austin LLP and UBS.

Cesar Pelli

César Pelli

César Pelli is an Argentine architect known for designing some of the world's tallest buildings and other major urban landmarks. In 1991, the American Institute of Architects listed Pelli among the ten most influential living American architects...

, who also designed the New Terminal at Reagan National Airport, redesigned the building by leaving two exterial historic limestone facades intact while replacing the rest of the structure. He also reduced the original 11 floors to 10 in an effort to augment the 1920s floor-to-floor heights. The restoration was completed in August 2001.

The building was formerly the location of the Warder Mansion

Warder Mansion

Warder Mansion is a Washington, D.C. apartment complex at 2633 16th Street Northwest. Located about 1.5 miles north of the White House, it is the only surviving building in the city by architect H. H...

, which was moved to Columbia Heights

Columbia Heights

Columbia Heights may refer to one of these United States locations:* Columbia Heights , a neighborhood of Washington, D.C.** Columbia Heights , a Metro station in Washington, D.C....

 by architect George Oakley Totten.