I don't know the details of your lease - rents, length of lease, triple net, commission amount - but if it makes financial sense and makes the customer happy then absolutely pay for it.

Nor is there a permit to do so. 

Check your local (city) municode to see applicable zoning rules/permitted uses.

I know from experience it will go nowhere because it's not illegal.If you were charged fees without your permission, or not permitted to be charged in your contract...then that would be illegal.

Don big difference in production building in the South /  compared to semi custom in other areas..

If you're custom building $100,000,000 in Palm Beach and that is their bread and butter market, they'll probably do what they can to make it right.

May be able to google too.Most wholesale carpet stores will quote you a lot less than the guys advertising on TV and with big fancy showrooms but know there is still room to negotiate but may take you purchasing several times so that the salesman realizes you are a return customer.

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If it tends to be for a pretty set time frame it may be more of a tutoring/teaching type of situation.I tend to stay out of my tenants' business unless it involves safety of the neighbors or some kind of major crime, so yes, drug dealing would fall into that but most lower level dealers will have more than 1 customer and many high level ones who might only have one visitor are not as likely to have them daily.

I would keep reaching out  (emailing is preferred, so it's in writing) to the county permitting department until you get a clear answer, even if it is "We don't have any occupancy septic rule".