Other producers are David Bernad and Ruben Fleischer through their company The District, and Paris Kasidokostas-Latsis and Terry Dougas through Rhea Films. Jean-Luc De Fanti and Anne Woodward are exec producing.
Hercules Film Fund is financing the film.
"Unicorn Store," written by Samantha McIntyre, centers on a woman who moves back in with her parents. She receives an invitation to a store that will test her ideas of what it really means to grow up.
See photos of Brie Larson through the years:
Actress Brie Larson holds her award for Best Actress in a Leading Role for the film "Room" during the Vanity Fair Oscar Party in Beverly Hills, California February 29, 2016. REUTERS/Danny Moloshok
Brie Larson accepts the Oscar for Best Actress for her role in "Room" at the 88th Academy Awards in Hollywood, California February 28, 2016. REUTERS/Mario Anzuoni
Best actress Brie Larson, "Room", reacts during the 88th Academy Awards in Hollywood, California February 28, 2016. REUTERS/Mike Blake
Actress Brie Larson poses at the AFI (American Film Institute) Awards 2015 luncheon in Los Angeles, California January 8, 2016. REUTERS/Mario Anzuoni
Actress Brie Larson poses at the BAFTA Los Angeles Awards Season Tea Party in Beverly Hills, California, January 9, 2016. REUTERS/Danny Moloshok
Brie Larson poses with the award for Best Performance by an Actress in a Motion Picture - Drama for her role in "Room" during the 73rd Golden Globe Awards in Beverly Hills, California January 10, 2016. REUTERS/Lucy Nicholson
Actress Brie Larson arrives at the 2014 Vanity Fair Oscars Party in West Hollywood, California March 2, 2014. REUTERS/Danny Moloshok (UNITED STATES TAGS: ENTERTAINMENT) (OSCARS-PARTIES)
Actress Brie Larson gives her acceptance speech after winning her Best Female Lead award for her role in "Room" at the 31st Independent Spirit Awards in Santa Monica, California February 27, 2016. REUTERS/Carlo Allegri
Actress Brie Larson arrives at the 88th Academy Awards nominees luncheon in Beverly Hills, California February 8, 2016. REUTERS/Mario Anzuoni
Actor Brie Larson, Jacob Trembley and Joan Allen arrive for the premiere of the movie "Room" during the 40th Toronto International Film Festival in Toronto, Canada, September 15, 2015. TIFF runs from September 10-20. REUTERS/Fred Thornhill
Actress Brie Larson poses for a portrait while promoting her upcoming movie "Room" in Los Angeles, California September 30, 2015. Picture taken September 30. REUTERS/Mario Anzuoni
Cast member Brie Larson poses at the premiere of "Don Jon's Addiction" during the Sundance Film Festival in Park City, Utah January 18, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
U.S. actress Brie Larson arrives for the premiere of Scott Pilgrim vs. the World at the Empire Theatre in London August 18, 2010. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT SOCIETY)
Cast member Brie Larson attends the premiere of the film "Greenberg" in Los Angeles March 18, 2010. REUTERS/Phil McCarten (UNITED STATES - Tags: ENTERTAINMENT)
Actress Brie Larson smiles during the news conference for the film "Rampart" at the 36th Toronto International Film Festival September 11, 2011. REUTERS/Mike Cassese (CANADA - Tags: ENTERTAINMENT HEADSHOT)
Cast member Brie Larson poses for a portrait while promoting her upcoming movie "Short Term 12" in Los Angeles, California August 6, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
Kassidokostas-Latsis and Dougas produced Lily Tomlin's "Grandma" for Sony Classics and Natalie Portman's "Jane Got a Gun. The deals are freshly inked and the filmmaking team is now prepping for an October production start.
Larson broke through with "Short Term 12" and won the Academy Award for Best Actress earlier this year for "Room." Upocming projects include Marvel's female-centric film "Captain Marvel" movie, Legendary's "Kong: Skull Island," Lionsgate's coming-of-age drama "The Glass Castle" and Ben Wheatley's crime thriller "Free Fire."
Larson is repped by WME and Authentic Talent and Literary Management.
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