Patty & Bun, the latest burger pop-up concept operator, is understood to have secured its first standalone site in London’s Marylebone. M&C Report understands that the concept, which is the brainchild of Joe Grossman, is close to taking on the former Mimosa site in James Street for its first standalone unit. The business, which has taken up temporary residencies at a number of bars and restaurants such as the Endurance in Soho and the Doodle Bar in Battersea, has been looking for sites of around 1,000 sq ft or less for its launch in the capital. It follows previous pop-up successes such as Pitt Cue Co and Meatliquor in making the move from temporary to permanent locations. Grossman recently told Property Week: “Lots of people are using these pop-ups as a test bed for new concepts. If landlords have got an empty site or a site with potential, pop-up operators are quite attractive, as they have a proven product and a bit of buzz around them. The Patty & Bun pop-ups are a great stepping stone to trying to get my own site off the ground.”