Tenant wants permission for a home occupation permit

[Som Jafari]

My tenant wants to start a home wholesale business selling children's dresses online. They need permission from the landlord to get their business license. I said I would call the city and get back to them.  They are fantastic tenants and assured me there would be no customers coming and going to the unit, as everything is bought and sold online and they will pick up and drop of shipments at FedEx. 

Has any one had experience with something similar ? I want to add an addendum o their contract stating there will be no customer or extra traffic. does anyone have a template for such an addendum ?