The Empire State Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

New York City's Central Park along Fifth Avenue is viewed in this aerial photograph from a helicopter over New York on November 11, 2008. (SAUL LOEB/AFP/Getty Images)

The United Nations (UN) Secretariat building stands along the East River in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The former headquarters of Bear Stearns, now owned by JPMorgan Chase & Co., center, stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Consolidated Edison Inc. (ConEd) East River Generation Plant stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Stuyvesant Town Peter Cooper Village, Manhattan's largest apartment complex, lower right, stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Aerial view of Madison Square Garden, 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

Office and residential buildings, including the Chrysler Building, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Empire State Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Citigroup Center, center, stands in between Citigroup corporate headquarters, center front, and a Citi building in the Queens borough of New York, top, in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office buildings, including the headquarters of JPMorgan Chase & Co., black buliding at center, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

A cemetery is seen September 13, 2009 in the Queens borough of New York City. (Photo by Mario Tama/Getty Images)

An American Airlines plane flies over a cemetery September 13, 2009 in the Queens borough of New York City. (Photo by Mario Tama/Getty Images)

Office and residential buildings, including a Citigroup building, center, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings, including the Chrysler Building, right, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Aerial view of New York Harbor showing the Statue of Liberty (C), Ellis Island and Manhattan (R), 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

Commercial and residential buildings stand in the financial district of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Time Warner Center, foreground, stands on Columbus Circle near the Hearst building in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Planes are seen at LaGuardia Airport September 13, 2009 in the Queens borough of New York City. (Photo by Mario Tama/Getty Images)

Office and residential buildings, including the Chrysler Building, right, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The General Electric (GE) building stands in Rockefeller Center in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings surround the MetLife building in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

New York City's Roosevelt Island is viewed in this aerial photograph from a helicopter over New York on November 11, 2008. (SAUL LOEB/AFP/Getty Images)

Cars pass along a highway September 13, 2009 in the Queens borough of New York City. (Photo by Mario Tama/Getty Images)

The General Motors (GM) building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The headquarters of The Goldman Sachs Group Inc., left, stands adjacent to the World Financial Center in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Construction cranes stand on the site of the former World Trade Center (WTC) in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Aerial view of ships docked at the New York Cruise Terminal on the West Side of Manhattan, 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

The Woolworth Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The XYZ Buildings, including News Corporation headquarters, lower right, stand in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Aerial view of an athletic field and the Manhattan Bridge (R), 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

Aerial view of Manhattan looking south over Central Park 01 July 2007 in New York City. (STAN HONDA/AFP/Getty Images)

Construction continues on the Beekman Tower, designed by Frank Gehry, in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

One Bryant Park, home to the offices of Bank of America Corp., stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings, including the headquarters building of the New York Times Co., left, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings stand around the Empire State Building in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Empire State Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Stuyvesant Town-Peter Cooper Village, Manhattan's largest apartment complex, stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The headquarters of the Goldman Sachs Group Inc. stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The headquarters of American International Group Inc. (AIG) stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Federal buildings surround Foley Square in downtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Boats travel around the tip of the financial district of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Daniel Patrick Moynihan Federal Courthouse stands in downtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Daniel Patrick Moynihan Federal Courthouse, left, New York County Supreme Court building at 80 Centre Street, bottom left, the New York County Supreme Court building at 100 Centre Street, center, and the Manhattan Municipal Building, top right, stand in downtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Piers stand along the Hudson River on the west side of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Commercial and residential buildings stand in the financial district of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The headquarters of The Goldman Sachs Group Inc., bottom left, stands adjacent to the World Financial Center in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Commercial and residential buildings, including the Empire State Building, left, and Madison Square Garden (MSG), center, stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Empire State Building stands in the distance beyond the Hudson Rail Yards in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Commercial and residential buildings stand in the financial district of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Chrysler Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Brooklyn and Manhattan Bridges cross the East River in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Governor's Island, center, sits in New York Harbor in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings stand in midtown Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Office and residential buildings stand in the financial district of Manhattan in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

The Empire State Building stands in this aerial photograph taken over New York, U.S., on Wednesday, July 7, 2010. Photographer: Daniel Acker/Bloomberg

Aerial view over the Upper East Side of Manhattan and Central Park (R) 01 July 2007 in New York City. (STAN HONDA/AFP/Getty Images)

Aerial view of Manhattan looking south-west over the Lower East Side (foreground), 01 July 2007, in New York City. Lower Manhattan (L) and New Jersey are seen in the distance. (STAN HONDA/AFP/Getty Images)

Aerial view of Manhattan looking southwest over Lower Manhattan, 01 July 2007, in New York City. The Manhattan (front) and Brooklyn (rear) Bridges span the East River from Brooklyn (L). New Jersey is seen in the distance (Right). (STAN HONDA/AFP/Getty Images)

Aerial view of Lower Manhattan looking northwest, 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

Aerial view of Manhattan looking north over the Lower East Side (foreground), 01 July 2007, in New York City. (STAN HONDA/AFP/Getty Images)

The Brooklyn Bridge, lower Manhattan and East River are seen in this view of the New York City skyline from the air in a helicopter above New York, April 22, 2010. (SAUL LOEB/AFP/Getty Images)

Lower Manhattan is lit up as night falls September 13, 2009 in New York City. (Photo by Mario Tama/Getty Images)

NEW YORK - SEPTEMBER 21: (EDITORIAL USE ONLY) In this handout photo provided by perspectiveAerials.com, an aerial view of Yankees Stadium is seen during the game between the New York Yankees and the Baltimore Orioles on September 21, 2008 in the Bronx borough of New York City. The Yankees are playing their final season in the 85 year old ball park and plan on moving into the new Yankee Stadium across the street to start the 09 season. (Photo by perspectiveAerials.com via Getty Images)

Midtown Manhattan is seen at dusk September 13, 2009 in New York City. (Photo by Mario Tama/Getty Images)

Midtown Manhattan is seen at dusk September 13, 2009 in New York City. (Photo by Mario Tama/Getty Images)