Friendship House (also known as The Maples, Maple Square, or Duncanson House) is a Georgian townhouse, located at 619 D Street, (630 South Carolina Avenue), Southeast, Washington, D.C., in the Capitol Hill neighborhood.

The first owner of the home was William Mayne Duncanson, whose house guests included George Washington.

On April 20, 1858, it was purchased by Louis François de Pourtalès; there are rumors of his winecellar.

In 1871, it was purchased by journalist Mrs. Emily Edson Briggs; she named it "Maple Square."

[3] As the Capitol Hill neighborhood gentrified, most of the people served were in other parts of Washington, D.C.[4] It was placed on the National Register of Historic Places on January 18, 1973.