Construction starts next week on the most unexpected tenant at Westfield Montgomery mall: a full-service 7-Eleven, complete with Slurpees, snacks and convenience foods. This will be a big store, stretching all the way from the recently vacated MVP Supreme space to Shilla Bakery just outside the main Dining Terrace. Meanwhile, gourmet popsicle shop Frozen Stuff on a Stick will be closing after a brief run in the former B/Bop/Q space just across the hall. Owner Joel Rogozinski says the location has not been a good fit for his $4 fruit-based pops, kombucha and nitro-brewed coffee. He’s looking for a more outdoor-oriented shopping center and expects to reopen shortly in this area.