Cityfile: New York's Most Notable and Influential

• One month after he unloaded his Greenwich mansion for $18.7 million, former Goldman Sachs partner Donald Opatrny has shed himself of his apartment at 15 Central Park West, too. The 35th floor, three-bedroom condo, which Opatrny purchased for $11.6 million in January 2008 and listed for $26 million in June 2009, sold for $21.5 million to an unidentified buyer. [Real Deal]
• Bobby Flay and wife Stephanie March have a new Hamptons home in mind. The couple paid $1.485 million for a 2.89-acre parcel of land in Amagansett, where they're reportedly planning to build a "green" home. [Newsday]
• Steve Madden is spreading out at 175 East 73rd Street. The footwear mogul has paid $2.2 million for a second co-op in the five-story building. Three years ago, he paid $3.6 million for the apartment next door. [Cityfile]

Happy Birthday | Two Seymours are celebrating today: Stephanie Seymour is turning 41; Philip Seymour Hoffman is turning 42. Woody Harrelson is 48. Daniel Radcliffe is 20. Don Imus turns 69. Michelle Williams of Destiny's Child is turning 29. Supreme Court Justice Anthony Kennedy turns 73. Local news anchor Kaity Tong is 60. Actress Stephanie March is turning 35. The New Yorker's Hendrik Hertzberg is 66. Estate jeweler Fred Leighton turns 77. LA Times columnist Joel Stein is turning 38. Slash from Guns N' Roses is 44. Marlon Wayans is 37. Interior designer David Kleinberg is 55. Country music star Alison Krauss turns 38.  And Ms. Monica Lewinsky celebrates her 36th birthday today.

• Mary Louise Parker was the center of attention at the Roundabout Theatre on Sunday for the opening night of her new Broadway show, Hedda Gabler. Parker and her co-stars, Michael Cerveris, Peter Stormare, and Paul Sparks, and the play's director Christopher Shinnas were joined at the play and after-party by Liza Minnelli, Joan Rivers, Blythe Danner, Mamie Gummer, Amy Irving, Billy Stritch, and Tovah Feldshuh. [PMc, Wireimage, GoaG]

• Famed African-American fashion designer Arthur McGee was honored with a luncheon at the MET yesterday. Guests on hand to fete McGee included André Leon Talley, Hamish Bowles, Lynn Yaeger, Susan Fales-Hill, Thelma Golden, Deborah Roberts, Steven Kolb, Jeffrey Banks, Cicely Tyson, Stephen Burrows, and Amy Fine Collins. [PMc, DFR, GoaG]More

• Did Lindsay Lohan split up with Samantha Ronson? Is she now in "complete denial" about it? And what's going on with her and Sean Penn? All good questions! [P6]
• Graydon Carter's plan to win over neighborhood critics of the Waverly has been revealed: He gives them tables at the restaurant and puts their pictures in Vanity Fair and, sure enough, his foes magically turn into friends. [P6]
• On the View yesterday, Tom Cruise described the death of Jett Travolta as "horrific," but said that Scientology had absolutely nothing to do with it. You've been warned, people. [People]
• Remember Lisa Bonet? Well, she just had a baby girl who she named Nakoa-Wolf Manakauapo Namakaeha Momoa. Yes, she stole the name you were planning to use. [NYDN]More

Happy Birthday | The still-stunning Stephanie Seymour turns 40 today. Also celebrating: Aged radio personality Don Imus is 68, Philip Seymour Hoffman is 41, and local news institution Kaity Tong is 59. Estate jeweler Fred Leighton (who is actually named Murray Mondschein) is 76. Harry Potter's Daniel Radcliffe is turning 19. Omar Epps is 35. The New Yorker's Hendrik "Rick" Hertzberg is turning 65. And former Law & Order actress Stephanie March will celebrate her 34th birthday tonight, an event that we imagine will be commemorated with an extravagant meal alongside husband, Bobby Flay.