Treadwell Park on the Upper East Side looks like any other sports bar. On game days, it can get packed with young business-casual types gathering to cheer at oversize screens, play foosball, and eat burgers and fries at communal wooden tables.

Downstairs, however, is a hidden lair for less rowdy types: a tasting room, dedicated to the best beer in the world. A former storage space, it can accommodate only about 10 people. This detail, however, didn’t stop the Samuel Smith Brewery, a prestigious beer-making family in England, from choosing the cellar to host one of the first-ever tastings in the United States of its oatmeal stout.

“It might be the most utilized space in the city,” said Sean Ellwanger, the New York City sales manager for Merchant du Vin, a beer importer.

Anne Becerra, the city’s first female certified cicerone (basically a beer sommelier), who oversees the beer program at Treadwell Park’s two New York locations, had the idea for the exclusive room, called the Cellar. “I love being upstairs. I think it’s fun. I love playing the games,” she said. “But sometimes you want to talk quietly and share a great beer somewhere private.”