For real?
Interesting...
I have a business in my home and when I checked into placing a simple shingle up, I was told "no way!" because I wasn't in zoning for a business. Yet, there's many, many people up the street from me (within 0.25 miles of my front door) who are within the same zoninig and yet they do have a sign up. They are most certainly residences with businesses - like mine. I never said "boo" about it - it wasn't worth the battle.
Silly me... I shoulda just put the sign up and said nothing because apparently they don't enforce the laws once the deed is done...