 The pub ceased trading in 1921 and the building was sold to restaurateurs J. Lyons and Co . It was adapted as the flagship site of the business , though it was not technically a standard Lyons Corners House . The restaurant remained popular , and could accommodate up to 300 people , as did Lyons Corner Houses across London throughout the 1920s and 30s , but fell out of favour as fast food began to become popular in the 1950s . 
