The Blackstone Block Historic District encompasses what was once a waterfront business area in Boston, Massachusetts. Due to the infill of land it is now slightly inland from the waterfront. The district is bounded by Union, Hanover, Blackstone, and North Streets, not far from Quincy Market and Faneuil Hall. It includes the Union Oyster House, a National Historic Landmark building erected in the 1710s, and a collection of commercial buildings dating from the late 18th and 19th centuries. It also includes the c. 1770s Ebenezer Hancock House (10 Marshall Street), a Federal-style wood-frame house that is the only building left in the city which was known to be owned by John Hancock. The building was declared a Boston Landmark by the Boston Landmark Commission in 1977 for it's notable exterior