The Bay Institute, a major opponent of the development, says the project would worsen Petaluma’s flooding problems and devastate the streamside habitat, in addition to destroying a historic building, known locally as the “red barn,” to make way for construction. Opponents also argue that the proposed project would contribute to suburban sprawl and prevent any chance of establishing a greenbelt to connect downtown Petaluma to a 216-acre regional park.

In response to the concerns raised, Davidson executives argue that all environmental regulations are being followed in the planning of the subdivision. They also state that a 200-foot-wide pathway along Kelly Creek to Helen Putnam Regional Park is included in the plans. This will preserve the habitat for the threatened red-legged frog and maintain 23 acres of open space.

Davidson purchased the property in 2004 for 7.8 million, and then filed an application with the city to change the land’s agricultural zoning and permit development. The city hasn’t made a decision on that request. Also, since the $ 1 million isn’t enough to purchase the property outright, the rest of the money will need to be raised.

The Bay Institute however, is hoping that when unreleased environmental reports are made public, developers will be persuaded to abandon the project. If that fails, the city council could also reject the plan.

Other groups have also been formed in opposition to the subdivision, including Petalumans for Responsible Planning. Their lawyer, Greg Colvin, said that the city council could also add stringent restrictions to the development and opponents could sue over elements of the soon to be released environmental report that they don’t like.

“As a last resort, we may consider a compromise between open space and very limited development, but we’re nowhere near that point yet,” he said.