The Key House, also referred to as the Key Mansion, was the Washington, D.C., home of lawyer and poet Francis Scott Key from 1805 to 1830. It was built in 1795 and demolished in the 1940s for a highway ramp.
The Key House was built in 1795 by a real estate developer and merchant. At the time the house was located on Bridge Street, since renamed M Street, and included thick walls, long hallways, two parlors, and six bedrooms, in addition to the kitchen and dining room. Key and his wife moved there in 1805 and raised their 11 children in the house; during this time, he wrote the poem that would later be expanded and turned into the national anthem, "The Star-Spangled Banner".
The Keys moved after the Chesapeake and Ohio Canal was built directly behind their house, although Francis continued using the one-story addition as office space. The house later became a hotel and restaurant, then a string of commercial enterprises, including a blacksmith shop, and a dry-goods store. With the construction of the Georgetown Car Barn across the street, the area around the house rapidly developed.
In the early 1900s, a group of historic preservationists purchased the house and established a museum honoring Key, but within a few years, the building was sold and drastically altered. The gabled roof and chimneys were removed, in addition to other modifications. Many people thought the original house had been demolished and replaced with a new building. When the Key Bridge opened in 1923, it was apparent the house might not survive. This came to pass in the 1940s with the construction of an exit ramp from the Whitehurst Freeway to the Key Bridge. The building was disassembled with plans to rebuild it somewhere else, but during the next several decades, all of the items were used in other buildings or stolen.
In 1993, the Francis Scott Key Memorial opened near the Key House site.