United States Capitol is from a
laser scan project conducted by nonprofit
CyArk. The circular Te Portico that extends into the space of the Saloon is a prominent architectural feature of the house, and one of Thornton's trademarks In 1789, after briefly practicing
medicine and pursuing an interest in
steamboats, Thornton submitted a design to the architectural competition for the
Library Company of Philadelphia's new hall. After more drawings were prepared, enthusiastic praise of Thornton's design was echoed by Secretary of State Jefferson: "simple, noble, beautiful, excellently distributed." For his winning design, Thornton received a prize of $500 and a city lot. The execution of the design was entrusted to the supervision of
Étienne Sulpice Hallet and
James Hoban, (1758-1831), (who had also submitted designs for the "President's House - later the
White House). Hallet proceeded to make numerous revisions, including removing the rotunda under which Washington was to be enshrined upon his death. So, on September 12, 1794 the President appointed Thornton as one of the three "Commissioners of the Federal District" in charge of laying out the new federal city and overseeing construction of the first government buildings, including the Capitol of which he became supervisor and remained in charge until 1802. Despite important changes and additions, (especially the substitution of a lower copper-clad wooden dome during the 1820s to 1856, for Thornton's original design), especially by second Architect of the Capitol,
Latrobe and third Architect
Bulfinch, much of the design of the façade of the central portion of the Capitol is his.
Other works (1800), Washington, DC , Fairfax County, Virginia (1805) (c.1808), Georgetown, Washington, DC (1789, replica constructed 1954), now Library Hall,
American Philosophical Society As a consequence of winning the Capitol competition, Thornton was frequently asked to give ideas for public and residential buildings in the Federal City. He responded with designs on several occasions during his tenure as a commissioner, less so after 1802 when he took on the superintendency of the Patent Office. It was during this time he was asked to design a mansion for Colonel John Tayloe. The Tayloe House, also known as
The Octagon House, in Washington, D.C., was erected between 1799 and 1800. It served as a temporary "Executive Mansion" after the 1814 burning of the White House by the British and the house's study was where
President Madison signed the
Treaty of Ghent ending the
War of 1812. In 1899, the building was acquired by the
American Institute of Architects, whose national headquarters now nestles behind it. Around 1800, he designed
Woodlawn for Major
Lawrence Lewis (nephew of
George Washington) and his wife,
Eleanor (Nelly) Parke Custis (granddaughter of
Martha Washington), on of Mount Vernon land. Sometime around 1808, he designed
Tudor Place for Thomas Peter and his wife,
Martha Parke Custis Peter (another granddaughter of Martha Washington).
National Register Many buildings designed by Thornton have been added to the
National Register of Historic Places including: •
Library Company of Philadelphia, 5th & Chestnut Sts., Philadelphia, PA; 1789 (demolished 1887; recreated as Library Hall, American Philosophical Society, 1954) •
United States Capitol, Washington, D.C.; 1793 - exempt •
Prospect Hill, NE of Long Green on Kanes Road, Baltimore, MD; 1796-1798 - added to registry in 1973 •
Prospect House, 3508 Prospect Street NW, Washington, D.C. - added in 1972 •
Octagon House, 1741 New York Avenue, NW, Washington, D.C.; 1799 - added in 1966 •
Woodlawn, W of jct. of U.S. 1 and Rte. 235, Fairfax, VA, 1800-05 - added in 1970 •
Tudor Place, 1644 31st Street, NW, Washington, D.C.; 1816 - added in 1966 ==Founding of the Washington Jockey Club==