The Sweeney family on Wednesday will lead a walking tour of the land where it wants to build the disputed Treasure development, a rare chance for City Hall officials and regular Parkites to learn about the project while at the site talking to the developer.

The visit to Treasure, situated on a hillside overlooking Old Town and just off streets like Lowell Avenue and Empire Avenue, will come as the Sweeneys continue to try to convince the Park City Planning Commission that the Treasure blueprints fit with an earlier approval for the site and nearby developments.

The tour is scheduled to start at 4:30 p.m. at the Town Bridge and last 90 minutes. It is part of the Planning Commission’s meeting, and it is open to the public. The Treasure land is immediately west of the Town Bridge, and the project site is visible from numerous vantages in that part of Old Town.

“I think they can see how the scale of the project fits into the topography of the mountain,” said Jack Thomas, the chairman of the Planning Commission. “I think that drawings are always a little hard to interpret because they’re two dimensional.”

He said the Wednesday Planning Commission visit to the site will be especially important for newer members of the panel who have not walked the site with the developer before.

Thomas said he expects some regular Parkites will attend, pegging the number at perhaps 25 people.

The Planning Commission at 6 p.m., meanwhile, is scheduled to hold a public hearing about Treasure. Only five minutes, though, have been set aside for the hearing, meaning that the Planning Commission does not expect a crowd. Another hearing is tentatively scheduled Sept. 23.

The Sweeneys hold rights to develop Treasure dating from the 1980s. But the Planning Commission has struggled with the design that the Sweeneys are pursuing for several years. Months have been spent discussing the traffic that Treasure is expected to attract to the neighborhood, and the Planning Commission is beginning its talks about the size of the proposed Treasure buildings.

The 1980s approval allows a hotel with approximately 200 rooms and another approximately 100 condominiums. The Sweeneys want an approval for 19,000 square feet of commercial space as well. The project would be built on the slopes of Park City Mountain Resort.

Pat Sweeney, who represents his family and will lead the tour on Wednesday, said upward of 50 people might attend. He wants the Planning Commission to have a clear idea of the desired layout of Treasure. Sweeney last took the Planning Commission to the site in 2004 or 2005, he said. The makeup of the panel has changed since then.

“I think it’s important for them to understand where this stuff will eventually happen on the ground,” Sweeney said.

He plans to talk about building heights and how tall they will look against the mountainous backdrop. He said the biggest building at Treasure will be smaller than the Marriott Mountainside at PCMR, one of the largest buildings in Summit County. The project will appear to be between 11 and 13 separate buildings, but they will be connected through an underground garage.

According to Sweeney, meanwhile, the tallest Treasure buildings would be approximately 90 feet tall, including one that would be put at the bottom of the Creole ski run in the middle of Treasure. Only the top 60 feet would be above the site’s grade, hiding some of that building from most observers, he said.

He said the heights of some of the other buildings will reach between 30 feet and 60 feet, but portions of those will also be built below the grade.

City leaders in the 1980s opted for taller buildings in exchange for an agreement with the Sweeneys to preserve much of the highly visible hillside as open space. If the buildings were smaller, the family would have sought approvals to develop more of the site, Sweeney said.

“It’s going to be tough — the heights. It is what it is,” he said, describing that he expects an “oh my God, that’s big” response from some.

The Treasure opposition, which has organized a group called the Treasure Hill Impact Neighborhood Coalition, has long been unhappy with the Sweeney plans, saying the project does not fit as it might have in the 1980s when the development rights were secured. The critics have pressed the Planning Commission and the Sweeneys on traffic and the height of the buildings, among other concerns.

Brian Van Hecke, an Empire Avenue resident and a leader in the neighborhood coalition, said he plans to attend the Wednesday walking tour, but he is unsure how many others from the nearby streets will also go along.

He said the tour will be an opportunity for people to listen to a detailed description of Treasure, but he also wants the Sweeneys and the Planning Commission to spend more time later studying images of the proposed buildings and how they would look on the existing streetscape.

“I would like people to understand what is 90 feet,” he said. “You have to put that in perspective.”