From the NY Times:
There are 920 football fields of available office space in Manhattan. More than 180 major buildings totaling $12.5 billion in value — from Columbus Tower at 1775 Broadway to the office tower 400 Madison Avenue — are in trouble, meaning in many cases they face foreclosure or bankruptcy, or have had problems making mortgage payments. Rents for commercial office space fell faster over the past two years than in any such period in the last half century.
More than half a dozen experts on commercial real estate in New York City said that despite some flickering signs of economic recovery here and elsewhere in the country, the universe of big buildings and giant apartment complexes has further to tumble.
Rents, they say, will go lower. Vacancy rates are likely to rise, too. Owners of troubled properties will face a final day of reckoning and in some cases lose their properties.
The Real Deal also says that downtown office vacancy rates may increase 64%.