Developer Larry Silverstein is planning to build the tallest residential building in New York just two blocks from the former World Trade Center site, at 99 Church St.

The 80-story limestone building, designed by architect Robert A.M. Stern, will contain 143 luxury condominiums and a Four Seasons Hotel that will occupy the first 22 floors of the structure and consist of 175 rooms. The building will be completed in 2010, Mr. Silverstein said in announcing the project yesterday.

The hotel’s lobby will be on Barclay Street, and the hotel will offer four floors of amenities space including lounges, a ballroom, meeting spaces, a spa, a fitness center, and a pool. The residents’ lobby will be at 30 Park Place, and there will be a public plaza on the east side of the building linking Park Place and Barclay Street.

“Larry and I wanted it to be different from the Trade Center,” Mr. Stern said. It’s not an office building it should be elegant and I think we made a building that is also distinguishes itself different from the Battery Park city buildings. This will be a unique building.”

Lower Manhattan is now home to 10 hotels offering a total of 2,474 rooms, and eight hotels currently being developed or under construction could add an additional 1,972 rooms, according to the Alliance for Downtown New York.

Mr. Silverstein yesterday touted the turnaround of Lower Manhattan.

“What’s going on downtown is more than a market cycle, it’s a permanent transformation in all sectors — commercial, residential, retail, and tourism,” he said. “The sheer breadth and diversity of the new downtown economy makes it more durable and more lasting than at any point in its history.”

Mr. Silverstein expressed concern about the Metropolitan Transportation Authority’s decision to reduce plans for the Fulton Street Transit Center, to be constructed just blocks from 99 Church St.

“There is not a question in my mind the Broadway-Fulton stop needs a complete and total rebuilding, and we all need to work assiduously as we can with MTA to make sure that that project goes forward. It is terribly important to the region,” he said.

The president and chief operating officer of Four Seasons Hotels and Resorts, Kathleen Taylor, told reporters that Mr. Silverstein had reached out to her company with the offer three months ago.