Review: Patti LuPone and Mia Farrow Clean Up in ‘The Roommate’

“Expansion is progress,” Sharon says sweetly, parroting a phrase from a business journal for the benefit of her new roommate, Robyn.

A ditsy 65-year-old divorcée, Sharon is a convert to the virtues of new ventures — even illegal ones — after years of a life in which options for growth seemed few.

But Robyn, who encouraged the experimentation from the minute she arrived to rent a room in Sharon’s Iowa City home, is alarmed by the change from meek to monster. A plate of pot brownies for the book club ladies is one thing; larceny is another. “Sustaining and expanding,” she warns, “are two different activities.”

Because Robyn is played by the surgically funny Patti LuPone, that line, not especially amusing in itself, gets a big laugh. And because Sharon is played by the preternaturally sympathetic Mia Farrow, her every hiccup and dither evokes a sigh.

Most of what either woman says in “The Roommate,” which opened Thursday at the Booth Theater, is greeted by one or the other response. The two actors, old friends and old hands, play beautifully off each other, expertly riding the seesaw of a play, by Jen Silverman, that throws a Bronx grifter looking to reform herself into an unlikely alliance with a flyover frump looking to ditch her flannel ways. The actors’ intense focus and extreme contrast multiply the material exponentially, sending it way past the footlights to the back of the Booth.

But as we’ve learned, sustaining and expanding are two different activities. Indeed, the Broadway supersizing of “The Roommate,” which has been produced regionally since 2015, does not necessarily represent progress, even as it no doubt reaps profit.