Hello, I just saw your question. If their smallest store is only 21 square meters, then your 31 square meters facade should be enough! Because it is a sales-oriented business model, in this case, you can use 11 square meters as a kitchen, and the rest can provide guests with a place to rest and eat! In fact, under reasonable planning, the maximum capacity of 31 square meters should be 56%, so as long as it is planned reasonably, it is very likely to be used as a snack bar. However, we should be optimistic about the lot, the flow of people, and the number of surrounding facilities and units, so as to stabilize the income of business!