A realtor can not answer a city ordinance or city code question. Your best bet is call the city and get the right answer. The city inspector would be involved with this. Good luck
Any other questions I can help you with about Real Estate I would be happy to help you with
Ingrid Ski Realtor
On the other hand, I can tell you that I know of others who have done just what you're asking about. The real question is, did they obtain permits or not?