Governor Spitzer, despite opposition from the mayor and the City Council speaker, is holding firm to his decision to sell the two plots of land in Manhattan where the now-defunct plan to expand the Jacob K. Javits Convention Center would have occurred. Proceeds from the sale would partially fund Mr. Spitzer’s $1 billion upstate development plan.

“This is a decision that can be made by the state authorities that own the property and may require some legislative enactment,” Mr. Spitzer said at the annual New York Building Congress forum.

“The way I see it is very simple: If at this point it is simply not economical under any circumstances to expand the Javits Center, you can either let the land lie fallow and let it be wasted or you can sell it and use it for good investments. There is no way we are building the Javits Center. It is not going to happen. I am not going to be for it and I am not going to waste public money,” he said.

The sale of the land would put to bed any possibility of a second phase of the expansion, which has emerged as a point of concern for both Mayor Bloomberg and Speaker Christine Quinn.

“Even if you don’t use it now, if you sold off that property it would keep us from, in the future, ever expanding Javits center in that direction,” Mr. Bloomberg said last week. “Now the governor, I think, said that it would raise some money to put into Javits but I’m not sure that’s a good tradeoff.”

In a statement after learning of Mr. Spitzer’s scaled back plan for the convention center, Ms. Quinn said: “The proposed plan would require a tremendously large amount of money for little gain. We cannot turn away from making the Javits Center — and New York City as a whole — one of the top urban convention centers in the country.”

Mr. Spitzer’s comments will likely serve as the final postscript on the Javits expansion plans, which have been slowly whittled down to a $1.6 billion renovation of the current site after both Mr. Spitzer and his predecessor, George Pataki, had pledged far more expansive projects.

Mr. Spitzer scrapped the expansion plan when he learned that costs would exceed $5 billion. Mr. Spitzer said proceeds from a $1.50-a-night hotel tax meant for the expansion would go toward the renovation of the existing space.

A spokesman for the Empire State Development Corp., Warner Johnston, said a portion of the proceeds from the sale of the land would go to upstate projects, while the majority would be dedicated to downstate development.

“As we are no longer at the larger expansion we are evaluating the sale of the parcel to the north of the site to fund developments in this area,” he said.

Mr. Spitzer, whose father was a real estate magnate, said construction costs are the no. 1 problem confronting the development community. He said that other major developments in the city — such as the World Trade Center, the Moynihan project, Hudson Yards, and the PATH downtown transit hub — would move forward.