The White House is the official residence and workplace of the president of the United States. Located at 1600 Pennsylvania Avenue NW in Washington, D.C., it has served as the residence of every U.S. president since John Adams in 1800 when the national capital was moved from Philadelphia. The "White House" is also used as a metonym to refer to the Executive Office of the President of the United States. The residence was designed by Irish-born architect James Hoban in the Neoclassical style.