It happened quite frequently in my hometown of Buffalo, NY – I think. I want to double check before I write up some examples, what do you envision that isn't a food truck, yet has no commercial real estate? Does opening a restaurant in a residential district count?

EDIT: I remembered one of them was featured in the NY Times this week, that makes it very to explain :) They started without a store front, selling bread to co-ops and food markets. It became a cult favorite, then it became a staple at local restaurants and coffee shops. They partnered with a excellent coffee shop, Public Espresso, to do a food truck, and launched this beautiful restaurant, in a light commercial corner in a heavily residential district. http://www.nytimes.com/2016/09/18/travel/breadhive-buffalo-r...