NEW YORK -- Here is a look at the status of the trade center's major components, according to its developers:
• Most of the 8-acre memorial quadrangle at the World Trade Center opened last year on the 10th anniversary of the attacks. But a museum being built in a cavern beneath the plaza is still incomplete. Work all but stopped last fall because of a funding dispute between the memorial foundation and the Port Authority of New York and New Jersey. Joseph Daniels, president of the National Sept. 11 memorial and Museum, said once construction resumes it will take more than a year to finish.
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• One World Trade Center, formerly known as the Freedom Tower, will open in 2014 on the northwest corner of the trade center site with 3 million square feet of office space. The spire atop the 104-story building will reach the symbolic height of 1,776 feet. There will be observation decks on the 100th, 101st and 102nd floors. The building without the spire has reached its full height of 1,368 feet. It is expected to cost $3.9 billion when finished.
• The first office building to open will be the 72-story 4 World Trade Center at the southeast corner of the site. It has reached its full height of 977 feet and is scheduled to open in October 2013.
• Just north of 4 World Trade Center is 3 World Trade Center, which is now an eight-story stub but will reach 80 stories and 1,150 feet when it's complete. Developer Larry Silverstein is required to lease at least 400,000 square feet of space before finishing the building. Silverstein's team is projecting completion in 2015 or 2016.
• At the site's northeast corner, 2 World Trade Center is up only to street level. The building is planned as an 88-story skyscraper but will not be built until the commercial real estate market picks up.
• The new transportation hub at the trade center will connect 13 subway lines and PATH trains to New Jersey when it opens in 2015. It will replace the temporary PATH station built after the Sept. 11 attacks. The station will serve 250,000 travelers a day. There will be two levels of retail space. The cost of the transportation hub, originally pegged at $2.2 billion, is now expected to exceed $3.5 billion.
• A performing arts center planned for the site has been in limbo for years. A board of directors was named this year and was given the task of raising money to build the center, to include a 1,000-seat theater.
• An underground vehicle security center and bus parking facility just south of the main trade center site will open in 2013.