The developer has long proposed offering a 35-acre plot of land for donation to the Five Rivers Environmental Education Center, but the Planning Board had expressed concerns over how the public would access the land.
"This was a major comment that we have received during the review process, that it would be a major benefit if we could provide that access," Lynch said.
While Five Rivers had been hoping for a wider easement, they have indicated the proposal should be acceptable, said town planners.
Planning Board Chairman George Leveille said the easement was "a milestone" for both the longstanding application and for town residents.
"We've been trying on projects in this vicinity to get access [to the area]and this is a favorable accommodation," he said.
Richard Tice of Brewer Engineering Associates said talks with the Army Corps of Engineers about the area's wetlands were going well, and should conclude within the next 30 days.
The Slingerlands development, if built, would be an 83-building development consisting of 30 twin homes or townhouses, 47 single-family homes and six larger "estate" style lots.
As a Planned Development District, the Town Board would have to rule on the project once the Planning Board makes a recommendation.