Tribeca is a neighborhood in Lower Manhattan, New York in the United States. Its name is a portmanteau composed of the words "Triangle below Canal Street", and is properly bounded by Canal Street, West Street, Broadway, and Chambers Street.The Tribeca name came to be applied to the area south of Canal Street, between Broadway and West Street, extending south to Chambers Street. The area was among the first residential neighborhoods developed in New York beyond the boundaries of the city during colonial times, with residential development beginning in the late 18th century. By the mid-19th century the area transformed into a commercial center, with large numbers of store and loft buildings constructed along Broadway in the 1850s and 1860s.Development in the area was spurred by the extension of the IRT Broadway – Seventh Avenue Line, which opened for service in 1918, and the accompanying extension of Seventh Avenue and the widening of Varick Street during subway construction in 1914. That resulted in better access to the area both for vehicles and for travelers using public transportation. The area was also served by the IRT Ninth Avenue Line, an elevated train line on Greenwich Street demolished in 1940.