Can I use an open flame? Just ask the lessor's property directly. Generally speaking, as long as there is a gas pipeline to enter the house and the fire control facilities are perfect (smoke alarm, automatic sprinkler system), open flames can be used in businesses and office buildings. Most of the shops that can do open fire catering in the real estate will be partitioned separately. It is useless for you to consult the fire department. Those grandfathers won't tell you, and you can't answer if you're not sure where to do it. Beijing is too big.