Stonington — The borough Planning and Zoning Commission will hold two public hearings Tuesday night on the Stonington Historical Society’s third version of a controversial plan to renovate and slightly expand the Old Lighthouse Museum.

The hearings, one for a text amendment and the other for a special permit and coastal site plan approval, are slated to begin at 7:30 p.m. in Borough Hall.

“As members of this community and this organization, as neighbors, as preservationists, we are all stakeholders in preserving this iconic piece of Stonington’s history and creating a welcoming and inclusive museum,” the society stated in an email urging residents to support the plan at the hearing.

In late March, the society outlined a new, smaller proposal at a community forum after neighbors of the museum opposed two previous designs in 2013 and 2015. Project Architect Conrad Ello said in March that the design has been reworked and scaled back to reflect the concerns of neighbors and to provide for the minimal essential needs of the museum, which is the need to restore the building to protect it and the exhibits while offering handicapped accessibility.

The original plan in 2013 called for an 805-square-foot addition off the rear of the museum that had a modern, glass-enclosed design and two handicapped-accessible bathrooms. The new proposal calls for a 495-square-foot structure that would contain a ticketing area, gift shop and one handicapped-accessible bathroom.

The addition could not be seen from Water Street and would allow ticketing and gift shop to be relocated from the front of the museum, which is not handicapped-accessible, and where they are mixed in with exhibits. Ello said he tried make the addition as traditional, historic and modest as possible with less glass and the look of a weathered shingle barn.

While some neighbors continued to express concerns about their fear the museum would host more special events on its lawn and generate more traffic, they also complimented the society on the new design.