The city's first school, the Western School, opened on the south side of Pennsylvania Avenue between 17th and 18th Streets NW in January 1806. The city's first sewer pipe was laid under Pennsylvania Avenue in 1829. By 1835, Pennsylvania Avenue was largely lined by two- to four-story Federalist row houses. The Baltimore and Potomac Railroad converted a house at the corner of 2nd Street NW and Pennsylvania Avenue into the city's first train station. It was abandoned in 1851 when the station moved to a more long-lasting location at New Jersey Avenue and C Street NW. The same year, the National Theatre opened on December 7. It was followed by the 400-seat Odeon in 1846, the 1,000-seat Adelphi in 1847, and Metzerott Hall in the 1860s. President Andrew Jackson approved the construction of the Treasury Building in 1836 (it was completed the following year), but the size and height of the building forced a rerouting of Pennsylvania Avenue and blocked the view of the White House from L'Enfant's "Grand Avenue." The city's first stock brokerage was opened by William W. Corcoran at 15th and Pennsylvania Avenue in 1837. The city blocks where the National Gallery of Art now stands became a fashionable residential area in the 1830s.