Prospect House is a historic building, located at 3508 Prospect Street, Northwest, Washington, D.C., in the Georgetown neighborhood.

History

It was built in 1788, by James Lingan

James Lingan

-External links:*-Baltimore Riot of 1812:**...

, designed by William Thornton

William Thornton

Dr. William Thornton was a British-American physician, inventor, painter and architect who designed the United States Capitol, an authentic polymath...

, architect of the United States Capitol

United States Capitol

The United States Capitol is the meeting place of the United States Congress, the legislature of the federal government of the United States. Located in Washington, D.C., it sits atop Capitol Hill at the eastern end of the National Mall...

. President John Adams

John Adams

John Adams was an American lawyer, statesman, diplomat and political theorist. A leading champion of independence in 1776, he was the second President of the United States...

 visited the residence and Gilbert du Motier, marquis de Lafayette was a house guest. It was a guest house, while Blair House

Blair House

Blair House is the official state guest house for the President of the United States. It is located at 1651-1653 Pennsylvania Avenue NW in Washington, D.C., opposite the Old Executive Office Building of the White House, off the corner of Lafayette Park....

 was under renovation.
Notable previous owners include Secretary of Defense James Forrestal

James Forrestal

James Vincent Forrestal was the last Cabinet-level United States Secretary of the Navy and the first United States Secretary of Defense....

.

Prospect House is listed on the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

, and is a contributing property to the Georgetown Historic District.
Its 2009 property value is $5,016,210.