Prospect House (Lingan-Templeman House): Built in the late 18th century, Prospect House is a prominent residence in Georgetown.

Prospect House is a freestanding late-Georgian style townhouse that was substantially altered in the 19th century and has since been meticulously restored. This late-18th century mansion, one of the most historically and architecturally important houses in Georgetown, has been continuously occupied by locally and nationally prominent families. General James McCubbin Lingan, the Revolutionary War hero and one of the 19 original proprietors who signed the agreement for the establishment of the District of Columbia, purchased the property on which Prospect House now stands in November 1788 for 250 pounds. He then built Prospect House at some point between then and 1793.

In the years since, the figures who have stayed at Prospect House have included the Marquis de Lafayette, first U.S. Secretary of Defense James Forrestal, and North Carolina Representative Richard Thurmond Chatham. The residence also briefly served as a guest house while Blair House, the president's guest house, was under renovation.

DC Inventory: November 8, 1964 (Joint Committee on Landmarks)

National Register: March 16, 1972

Within Georgetown Historic District