Architecture of New York City high crime, prompting many to consider these projects a failure. A distinctive feature of residential (and many commercial) buildings in New York City is the presence of wooden roof-mounted water towers, which were required on all buildings higher than six stories by city ordinance in the 19th century because the municipal water pipes could not withstand the extraordinarily high pressure necessary to deliver water to the top stories of high-rise buildings. New York City is located on one of the world's largest natural harbors. The boroughs of Manhattan and Staten Island are their own islands, while Queens and Brooklyn are
Staten Island Tunnel funded by the city, the tunnel was expected to help expand the then-sparsely populated borough in a similar manner to the population and development explosions seen in Brooklyn and the Bronx. Under the Dual Contracts, three routes were proposed—two to Brooklyn and one to Manhattan—which would connect the Staten Island Railway's rapid transit service (SIRT) to existing subway lines. The Manhattan proposal, often called the "direct route," would have connected with the Interborough Rapid Transit Company (IRT)'s lines under Battery Park, near the current Brooklyn–Battery Tunnel. "Direct Route A" would have utilized a five-section tunnel under the New York Harbor,