After months of speculation surrounding the future of the Filene’s building in Downtown Crossing, developers have announced the complex will house retail shops, offices, condominiums and a hotel.

The development will not come without complications — two of the four buildings Gale International and Vornado Realty, Inc., will purchase for $100 million from Federated Department Stores are designated Boston Landmarks and carry with them a host of regulations.

The original Filene’s building, built in 1912, is also listed on the National Register of Historic Places. An Oct. 19 announcement released by Mack-Cali — which cosigned the venture agreement with Gale International — called the planned redevelopment, scheduled to begin June 2007, “part of the largest historic renovation in the history of Boston.”

According to company officials, developers plan to capitalize on the two older buildings’ historic significance, rather than try to circumvent the regulations involved in renovating them.

“Both of those buildings we intend to preserve and rehabilitate,” said Bob Maloney, senior vice president of Gale International.

Maloney added that the other two buildings, built in the 1950s and 1970s, are “not historically significant,” so the developers plan to demolish them to make way for the tower that will be part of the project.

Although the developers have been talking with potential retailers who might open up shop in the buildings, Maloney said no deals have been signed yet.

“We don’t have any specific stores lined up yet,” he said, adding that the popular Filene’s Basement discount store — long located in the basement of the historic Filene’s building — will remain open.

Developers also have not yet selected a hotel for the space.

“In a great location like this, we won’t be looking for an ultra high-end hotel,” Maloney said, adding that developers were definitely seeking a four-star hotel.

Maloney said it is not finalized whether the complex would sell affordable or luxury condominiums. He said the condominiums, which will begin on the 23rd floor of the planned tower, will have expansive views of the Charles River, Boston skyline and surrounding areas.

“Obviously, that kind of view comes with a price,” he said.

The developers also plan to open a restaurant on the hotel’s first floor where hotel guests, area businesspeople and shoppers could dine. A restaurant, Maloney said, is “much needed in that neck of the woods.”

“[The redevelopment is] only going to be a good thing,” he added. “I think it’s the kind of mixed-use project that can really bring Downtown Crossing into the 21st century. We want to protect and improve [the historic buildings]. We want to bring them back to what they once were.”

Pending approval by area regulatory agencies, if construction begins mid-2007 as planned, Maloney estimated the redevelopment would be completed by late 2010 to early 2011.

Filene’s Basement spokeswoman Pat Boudrot said the store has a long-term lease on the building space, so the building’s buyers had to leave room for it as a tenant in any remodeling plans. Boudrot said the planned redevelopment would make Filene’s Basement’s retail space “a little bit cleaned up,” but otherwise mostly unchanged.

Boudrot said store will move to a different location in the same building for the duration of construction.

“That’s going to be tough,” she said. “It’s an inconvenience for us.”

However, she added that the temporary difficulty would be worthwhile.

“What’s at the end of that tunnel is a revitalized downtown crossing, so we’re excited,” she said.

Boudrot said Filene’s Basement would likely maintain or improve its popularity through the redevelopment, especially because new retail shops in the building may boost business.

Vornado Realty Trust declined to comment on the project, citing company policy that prohibits public statements about its transactions.