BOSTON — The Boston Red Sox are wrapping up almost a decade of renovations to Fenway Park that should keep their venerable ballpark open for another 30-50 years.

"We are committed to Fenway Park — short-term, middle-term, long-term," team president Larry Lucchino said today as the Red Sox unveiled their winter renovation plans. "We're going to be here. No thought has been, or is being given to a new ballpark."

Past years' renovations have included the Monster Seats above Fenway's famous left-field wall, new and improved luxury suites and expanded concourses that have given Red Sox fans room to roam. This year's more modest goals are to waterproof the concrete under the lower deck sections, replace and repair the seats from first to third and add upper deck seats down the first-base line.

While the legal capacity — including those who work at the ballpark — will remain 39,928, the net result of the changes will be the addition of about 350 more seats and a sellout crowd of about 37,750 for night games.

"There's no reason they couldn't play here for generations to come," project leader Janet Marie Smith said. "There's no reason it should become physically obsolete. It survived the domes and it survived the multipurpose arenas. It's back again."

Next year's plans include waterproofing the rest of the lower deck, a section that was added onto the structure in 1934. Other, smaller projects that come up will be tackled when they arise.

"We are in the eighth inning of a nine-inning game," Lucchino said. "I'm certainly glad that we are in the closing innings of this gigantic undertaking."

The majors' oldest and smallest ballpark, Fenway opened in 1912 and is being shored up to last through its 100th anniversary, when the Red Sox are hoping to host the All-Star game, Lucchino said. But it's not clear how long the Red Sox can stay in a ballpark lacking some of the revenue sources built into new facilities, like the $1.3 billion Yankee Stadium scheduled to open next spring.

"(We) spend a lot of time discussing what's happening with other ballparks," Lucchino said. We'll be watching with interest how that new ballpark affects their revenue and their financial wherewithal."

The Red Sox will also be watching to see whether the new ballparks can be supported if the economy continues to sour.

"We have not had the kind of economic downturn the nation is confronting right now," Lucchino said. "I think we'll all learn a lot."