More than a year after East Hampton Town agreed to preserve a historic Montaukett house, the structure remains unrestored with its roof partially collapsed, and preservationists worry it could decline beyond saving.

Historians said they plan to meet on May 25 with Supervisor Larry Cantwell to explore options for preserving the 19th century home known as the Fowler House, named after the Montaukett family that lived there until the last occupants died in the 1980s.

“When the roof goes, you have to fix it as quickly as you possibly can because you run the risk of losing the rest of the structure,” said Allison McGovern, an archaeologist who has studied the site and teaches at Farmingdale State College.

Town officials had eyed the 1.7-acre East Hampton property for affordable housing — until historians discovered two years ago that a tiny saltbox-style house on the site was the last surviving dwelling built by members of the Montaukett American Indian tribe.

The East Hampton town board agreed in February 2015 to preserve the home, but its windows remain boarded up and a tarp covers a hole in the roof, where rain and snow entered for years, preservationists said.

Cantwell said town personnel are seeking state historic designation for the house and that the application should be complete by the end of summer and could even open opportunities for government funding.

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He said initial discussions with preservationists have focused on a private fundraising effort to save the home. He said he envisions a nonprofit group maintaining the house as a landmark or museum, but it’s likely that sections of the house must be rebuilt.

“It’s in very fragile condition,” Cantwell said. “Over the years, it was unprotected. We had a tarp over parts of the roof this winter just trying to keep the water from infiltrating the structure. Even prior to that, the house had deteriorated substantially.”

Georgette Grier-Key, executive director of the Eastville Community Historical Society in Sag Harbor, said she is part of an ad hoc group of preservationists seeking grants to save the house before it declines further. But she said funding the restoration is a heavy lift for just a few volunteers.

James Devine, a Montaukett who grew up next door to the Fowler House and worked for years to save it, said it will take “broad community effort” to preserve the dwelling.

“I just hope the Town of East Hampton finds the time, energy and money to preserve this historic structure,” Devine wrote in an email. “Nothing has been done to preserve the history of Native Americans and African-Americans in East Hampton and this needs to be corrected. This house affords them the opportunity to do something special that is long overdue.”