Time could be running out for Silverstein. He faces a deadline next week ordered by Governor George E. Pataki that could dramatically reduce his rights to rebuild the site.
''I want to see this get done in my lifetime," said Silverstein, who is 74 years old.
Colleagues say Silverstein has been guided by a mission that began just after Sept. 11.
''He really does believe that it's his destiny, so to speak, to do it, and to do it right," said David Childs, the architect of the iconic Freedom Tower.
Critics, among them Mayor Michael Bloomberg in recent months, say that Silverstein will probably run out of rent money.
Silverstein has paid $10 million a month since September 2001, without the rebuilding factored into the five-structure plan. Some of the critics say he is misjudging the market and the downtown community's need for so much office space.
''It's a very big part of this city," Bloomberg said last week of the 16-acre site and of the development. ''It's not just something where a private developer, I believe, can go off and do whatever he or she wants and is in their economic interest."
''We're at a point now where we have some grave concerns about his ability to the complete the entire site," said Charles Gargano, a deputy chairman of the Port Authority of New York and New Jersey, the site's owner, which is renegotiating Silverstein's lease.
Supporters say the problem with rebuilding and delays is not Silverstein.
''The one building he's had total control over, he rebuilt," said Steven Spinola, president of the Real Estate Board of New York.
Silverstein plans an opening in May for Seven World Trade Center, a building that also collapsed on Sept. 11 but that is not on ground zero and that thus is not under the same scrutiny as other planned properties.
His acquisition of the trade center, six weeks before the towers collapsed, was seen as a gamble.
The trade center ''wasn't considered the most desirable office space in the world" because it went years with high vacancy rates and was bombed in 1993, said Kathryn Wylde, president of the Partnership for New York City, a business leadership group.
After another developer dropped out, Silverstein led a group of investors with a $3.2 billion bid.
Raised in Washington Heights, Silverstein joined his father's real estate business while he was still in law school; he later founded his own firm.
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