You'll want one of these signs (to be installed after the city inspector leaves):
https://www.amazon.com/Afterprints-CLARITY-Parking-Ridiculous-Aluminum/dp/B077NR8ZGP
If you get a cease-and-desist after somebody complains, try this sign I just made up:
https://www.amazon.com/Afterprints-CLARITY-Parking-Ridiculous-Aluminum/dp/B077NR8ZGP
If you get a cease-and-desist after somebody complains, try this sign I just made up: