Zosia Mamet, the actress and daughter of playwright royal David Mamet and actress Lindsay Crouse, has sold her Upper West Side apartment for $1.2 million.

Mamet killed it in “The Flight Attendant,“ where she played Kaley Cuoco’s best friend on and off screen in a more grown-up version of her starring role in Lena Dunham’s often-maligned “Girls.” 

The two- or flexible three-bedroom maisonette-style apartment is in a prewar building designed by Rosario Candela at 522 West End Ave.

Listed most recently for $1.25 million in February, this deal comes at a bit of a loss for Mamet, who purchased the spread in 2015 for $1.22 million.

An entry foyer opens to a large living area between two bedrooms — and a windowed, wood-paneled dining room. Both bedrooms overlook the building’s rear garden.

The unit also features a kitchen with lots of storage and details like restored solid hardwood floors, original wainscoting, high ceilings and large windows. The building comes with a shared back patio garden and bike storage.

The listing broker was Colin Montgomery of Sotheby’s International Realty.