JUPITER — New Haven is the kind of place where kids set up lemonade stands. There are weekend block parties, and neighbors strike up a conversation while they're picking up their mail.

"It's sickly sweet Americana," says Elizabeth Speert, a homeowner on Paradise Circle.

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Don't mistake Speert's humor for complaining; the truth is, she's grateful.

But between the front porches and pretty flower beds, there are some big concerns in the neighborhood.

The problem? Greenwich.

The potential fallout? The future prospects of a prime 30-acre tract across from the Scripps campus in Abacoa.

That's because Greenwich's developer, New Urban Communities, wants to do away with 28 condos initially planned at its site and turn them into offices. It also wants to add more shops and restaurants to the unfinished project on Military Trail.

New Haven residents are fighting these plans. But a green light for Greenwich means a go-ahead to an agreement that will increase the biotech potential at the land across from Scripps.

The Jupiter Town Council will consider approving these measures in a special meeting at 7 p.m. today at town hall.

New Urban Communities Vice President Tim Hernandez says his firm wants to do away with the condos because the real estate market has stalled.

These days, there would be more demand for project if it had more offices, he says.

The developer was willing to ride out the market, Hernandez said, until New Urban was approached to transfer some of its so-called "research and development" rights to the vacant land across from Scripps.

Although New Haven residents say they support the town's biotech vision, they oppose altering Greenwich's plans.

They say Greenwich won't have the parking it needs for the shops and restaurants. And that the more people who go there, the more likely that traffic could overrun the cozy residential neighborhood across Quarry Knoll Street.

Four years ago, Greenwich was approved as a complex of shops, offices and homes on 14 acres beside New Haven.

The current proposal is one part of a complicated shuffling of development rights within Abacoa.

To keep biotech space close to the Scripps Florida headquarters, Abacoa Development Co. is redistributing 226,000 square feet of research-and-development space, moving it west of Military Trail to a 30-acre tract on Central Boulevard.

The move would increase the development potential on the property by more than a third.

Representatives of the 30-acre tract's owner, Workplace Florida Ltd., have told town officials that Greenwich's plans must be approved before they can inherit the extra development rights.

It isn't yet known what plans could be in the works for the site, but the request could be a sign of movement.

"I would suspect they have got something going on, but we don't know anything," said town Planning and Zoning Director John Sickler.

A Workplace Florida representative could not be reached for comment Monday.

Meanwhile, many New Haven residents worry about what will happen to their neighborhood. More than a dozen of them went to town hall Jan. 16, when the council first discussed the development swaps.

Homeowners say the area is seeing a lot of development fast. Greenwich is still under construction and Bermudiana, a commercial project just north of it, also is under way.

In the meantime, the residents already see problems with traffic. They say the traffic signal cycle at University Boulevard and Military Trail is too short for drivers heading south.

So when cars start stacking up, they cut through New Haven Boulevard to get to Frederick Small Road, where they can turn to go south either on Military or Dixie Highway.

And these cars often are zooming by, residents say.

Also, Speert worries that the more shops in Greenwich will mean more visitors, and that will mean more congestion, which will prompt more people to cut through her neighborhood.

"Traffic is like water," she says. "If you block it in one place, it's going to come out somewhere else."

There's also the issue of parking. Greenwich's plans count parking garages as part of the project's parking requirements, but New Haven residents say it'll be hard to stop someone from using their garage as storage space.

And if parking runs out, residents predict that visitors will turn to New Haven for its on-street parking.

Tonight, council members will try to balance a neighborhood's quality of life with the north county's plans to become a biotech hub.

Suggestions call for New Urban to conduct yearly parking studies for three years and if a shortage is found, it'd be the developer's responsibility to come up with a solution.

As for the traffic, town planners recommend that New Urban install a left-turn lane on Military Trail leading into Greenwich, something that will help the timing at the University traffic light. They also want the developer to put in traffic-calming measures along Quarry Knoll.

But New Urban wants to do one or the other, not both, because of costs, Hernandez said.

He won't speculate on how things will end up tonight.

When council members first heard of New Haven's complaints this month, they were sympathetic. They vowed to work out a compromise.

But some officials also were concerned about delaying their biotech goals.

"Big picture, I still got my eye on the prize," Councilman Todd Wodraska said. "And I'm not going to lose sight of that."