Owner of commercial property

[Troy Langbehn]

looking to do some work on a commercial building . I am not a contractor , but some of the work I would like to perform myself adding facia , some plumbing , some roofing. The city states I need licensed contractors to preform the work. Is that actually a fact if I own the commercial property ? Should  I just be able to get a permit ? Is there something in the international building code that allows the owner to work on his/her property.   some kind of document to show the city or is this even an option ? Thanks for advice