Empty Nesters Peter Masterson, Carlin Glynn Sell Duplex for $10.8 M.

transfers 1165fifthave1h Empty Nesters Peter Masterson, Carlin Glynn Sell Duplex for $10.8 M.Peter Masterson starred in the The Stepford Wives, that 70’s classic about murderous suburban Connecticut lady robots, and he co-wrote The Best Little Whorehouse in Texas—his wife Carlin Glynn starred in its first two Broadway runs. But for the past three decades the couple has owned a penthouse duplex at 1165 Fifth Avenue, quite boring compared to Stepford or a brothel.

He and Ms. Glynn, city records show, just sold that duplex for $10.875 million to hedge-fund star Brenda Earl.

Their duplex has a 1,150-square-foot wrap terrace, a massive solarium and 21 windows facing Central Park. “It always impressed me as really one of the great places to live in New York,” said Brown Harris Stevens managing director Kathy Sloane, who listed the 10-room apartment.

Yet Ms. Glynn is getting a massive discount from her sellers’ original 2005 listing price—$15.2 million. That tag was eventually cut to $12.9 million. “Basically,” Ms. Sloane said, “achieving an excess of $10 million north of 96th Street is very difficult.”

The Masterson penthouse is on the corner of 98th Street, which counts as not-quite-perfect in the epically picky Upper East Side—never mind the duplex’s park views or three fireplaces or wood paneling or beamed ceilings. (“The 60’s are busy,” Ms. Sloane’s colleague Sami Hassoumi once told The Observer. “The 80’s are a bit high.”)

That’s not why the Mastersons are leaving. “They raised all their children there”—their kids include the actress Mary Stuart Masterson—“and they want to live partially in Mexico and upstate,” Ms. Sloane said.

But there aren’t many Mexican duplexes with 30-foot-long living rooms, or with a little study adjoined to a library, or a kitchen in between a maid’s room and pantry.