For the first time in about 25 years, the New York City area will get a new professional sports venue. Actually, all nine major sports franchises in the New York City area could be playing in shiny, new arenas in the next few years if things go according to plan.

The Yankees, Mets, Jets, Giants, Knicks, Nets, Rangers, Devils and Islanders have indicated their intention to upgrade their current facilities. NASCAR is also seeking to enter the lucrative New York sports business and construct an 80,000-seat auto racetrack in Staten Island.

Collectively, the projects will cost billions of dollars in private investments, and hundreds of millions of dollars of public subsidies. In return, the owners of the sports teams have promised tens of thousands of construction jobs, thousands of permanent jobs, hundreds of millions of dollars in increased tax revenue for municipalities, and broad economic development.

As with most new arenas across the country, the New York crop will all likely have more luxury boxes, better concessions, a generally more pleasant spectator environment, and higher ticket prices.

According to journalist Neil deMause, who is the author of the stadium development Web log Field of Schemes, it is not the first time that several new stadiums have appeared on the development radar screen at the same time. Mr. deMause said that during the Giuliani administration, several new sports venues were being discussed, including a cricket grounds, but only two minor league baseball parks were actually built. He said with the current batch of new stadiums fall on a spectrum of probability of whether or not they will actually become reality.

“Some of it is a pent-up demand,” Mr. deMause said.

“Part of it is the continuation of what is going in the last 15 years in sports, but for one reason or another, it now seems to be the time for New York,” he continued. If all the New York-area stadia get built, Mr. deMause said, there could be a glut after the “honeymoon years” come to an end.

Yesterday, it was the Mets that disclosed finalized plans to build a $715 million stadium (including related infrastructure costs) that will house about 45,000 fans when it opens in 2009. It will replace Shea Stadium, widely recognized as an orange architectural folly, which opened in 1964.

On Wednesday, the Yankees received the final land use approval necessary to begin construction this spring on a new $1 billion stadium in the Bronx.

In both baseball stadium deals, the city and state agreed to pay directly for related infrastructure costs while the teams picked up the costs of constructing the actual ballparks. For the Mets, the city will contribute $90 million and the state will pay $75 million. In the Yankees deal, the city will contribute about $135 million to create new parks and enhance infrastructure, and the state will pay $70 million for additional parking facilities. There are also millions of dollars of indirect subsidies, in the form of tax discounts, rent credits, and cheap financing involving tax-free municipal bonds.

Mayor Bloomberg, who has been a strong advocate of the two plans, said yesterday that the new arenas equate to economic development.

“Baseball stadiums are one of those things that if you’re not a sports fan, you say, ‘Why?’ Well, the impact on everything else justifies it,” he told reporters.

The last professional sports venue built in the New York area was in 1981 when the Brendan Byrne Arena went up in East Rutherford, N.J. The building is now known as Continental Airlines Arena and home to the Devils and Nets, two teams that plan on moving out soon.

Construction on the Devils’ new rink in downtown Newark began last year. The Nets are hoping to move into a $660 million new arena in Brooklyn in time for the 2009-10 basketball season. That project, which is part of the larger $3.5 billion plan to build more than a dozen residential towers, faces community opposition and still must get state approval.

A lease agreement is expected soon on a new rink for the Islanders in Hempstead, L.I. The rink comes as part of a $1.6 billion project that will include apartments, a minor league baseball stadium. and a convention center.

Currently, the long-shot stadium deal is a new Madison Square Garden to house the Knicks and Rangers. The developers of Moynihan Station, to be built across the street from the current Garden at the site of the Farley Post Office, have had serious discussions with the owner of the teams about building a new arena in the back of the new transit hub on Ninth Avenue.

The real impact of new sports venues on the surrounding neighborhoods has been questioned by economists, most prominently Andrew Zimbalist of Smith College, who says that the amount of “trickle down” from the arenas into the neighborhoods is more like a “light trickle.” Rep. Anthony Weiner, a Democrat of Queens, and a Met fan who supports the new stadium, said that sports stadiums have “more flash” than typical economic development projects, but government support of small businesses is no less important.

“I would hope that this administration and all administrations say we want this big corporate citizen to be successful, and we also want to make sure the small citizens are successful,” Mr. Weiner said.

The director of Good Jobs New York, Bettina Damiani, said that local governments are getting bullied by the sports teams, and that elected officials could negotiate better deals.

“Do you think major sports franchises around New York City are having trouble paying their bills?” Ms. Damiani said. “We shouldn’t assume automatically that public dollars should be invested.” Critics say the public subsidies, and the officials who authorize them, could be used more effectively.

Mr. deMause, the Web site operator, said: “Dan Doctoroff is spending a lot of time on stadiums that he could be spending on something else, like housing or other forms of economic development.”

While leaders, including Mr. Bloomberg and Governor Pataki have promised that the effects of a new stadium can only be good on the surrounding neighborhoods, some local leaders have sought to extract more guarantees in the form of community benefit agreements.

The Yankees have agreed to give more than $1 million a year to community nonprofits to support youth groups and job training, and made guarantees that a certain percentage of construction and stadium jobs will go to the surrounding community.

Now, Queens wants its piece of the Mets pie. Members of the Queens delegation of the City Council postponed a finance committee meeting scheduled for Monday that would have considered the amount of taxes the Mets will pay on their new stadium, the last approval necessary for construction to proceed.

Council Member Hiram Monserrate, who represents the district around the proposed stadium, said he was using the little political leverage he has in the Mets deal to gain concessions.

“We love the Mets. But we also want the Mets to be good corporate neighbors,” he said. “The same way the residents of the Bronx are benefiting from an agreement from the Yankees, Queens residents should benefit from an agreement with the Mets.”

Mr. Bloomberg’s highest profile stadium effort, a Jets stadium on Manhattan’s West Side that would have also served as a convention center and as home to the 2012 Olympics, was scuttled by opposition in Albany.