Fox Searchlight plans a 2009 release. Executive vice president of worldwide acquisitions Tony Safford, vice president of acquisitions Ray Strache and vice president of business affairs Megan O'Brien negotiated the deal with The Film Sales Company president Andrew Herwitz for the film-makers.
Hugh Dancy, Rose Byrne, Peter Gallagher, Amy Irving and Frankie Faison star in the story of a love that develops between a woman and the beguiling, astronomy loving man who lives in the downstairs apartment of her building.
Leslie Urdang, Miranda De Pencier and Dean Vanech produced and the executive producers are Dan Revers and Christina Weiss Lurie.
Fox Searchlight Pictures president Peter Rice said: 'Adam has deeply satisfying and romantic storytelling, pitch perfect performances and the discovery of a new American film-maker. This is what Sundance is all about.'
'Before today, I'd seen Adam a few times in groups of six or eight friends,' Mayer said. 'Hearing an audience of 1,400 strangers take the movie into their collective hearts this afternoon was overwhelming, humbling and incredibly gratifying.'