People who rent commercial kitchens know that in most jurisdictions it is illegal to cook and sell food from your home kitchen–other than small scale bake sales for scouts, church fund raisers and the like.
The local Health Departments want to make sure that cooks are following the proper guidelines for the safe handling of food. This to prevent dangerous pathogens such as salmonella from making people dangerously sick. The things they look for are adequate cooling and freezing temperatures for the storage of meat and other perishables inside refrigerators. They also demand that preparation tables and other surfaces are clean and capable of being thoroughly cleaned to prevent bacteria from growing. They look for proper ventilation.