On Feb. 3, Mr. Damon’s offer was accepted on a $5.9 million apartment [in celebrity-packed One Beacon Court.], according to a source with knowledge of the deal. Located on the 39th floor of the Cesar Pelli–designed Bloomberg tower (with interior finishes designed by Jacques Grange), Mr. Damon’s apartment includes three bedrooms and two and a half baths, as well as a dining room, windowed kitchen, and full city and park views.

Phillies right-fielder Bobby Abreu owns a pied-à-terre at One Beacon Court. But the roster of non-athletic celebrity tenants is more glamorous: Beyoncé Knowles, NBC Nightly News anchor Brian Williams, former G.E. chief executive Jack Welch, current G.E. chief executive Jeffrey Immelt, and record mogul Alan Meltzer, who purchased a penthouse for $27 million.

Now that Mr. Damon is finally settling down in the city, he might be more motivated to sell his Brookline residence, which is located near Fenway Park. In 2004, Mr. Damon dropped $4.75 million on the modern, 6,800-square-foot home.

Giambi was back in town Tuesday to help unveil The Zone, a state-of-the-art therapy and play environment in the Kravis Children's Hospital at Mount Sinai Medical Center. Giambi is a major donor to the Garth Brooks Teammates for Kids Foundation, which combined efforts with the Troy Aikman Foundation and the Starlight, Starbright Children's Foundation to complete the new facility.

Like most athletes, Giambi prefers not to publicly discuss his charitable endeavors. But Oakland Athletics coach Ron Washington, who lost his New Orleans home in Hurricane Katrina, said he cried recently when Giambi delivered an unsolicited check for $20,000.

Brooks said the entire Giambi family, including brother Jeremy and his parents, have been extremely charitable. "They give tons and tons of money, but you never know which boy it's coming from," Brooks said. "They're never going to speak up and say it."

"There's nothing more special than seeing excitement on a child's face," Giambi said.