Glazing in walls, enclosures or fences containing or facing hot tubs, spas, whirlpools, saunas, steam rooms, bathtubs, showers and indoor or outdoor swimming pools where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface shall be considered to be a hazardous location.

Offer to buy them a few indoor portable heaters until you find a solution. 

Would you think a store that had a small step at the front would be compliant if they had a small metal portable ramp they could lay down over the stairs in case someone in a wheelchair were to come?

Quote from @Alecia Loveless: I had a tenant that used a portable washing machine.

You can find a bunch of lists that mention top amenities such as hot tub, sauna, etc.

Or maybe it has a theatre and sauna or something.

The property I am submitting on this week has a hot tub,  sauna, and beautiful view.I will be adding ac, EV charger, foosball table, table tennis, billiards.  

Oh yeah, the sales person told me i need to use a portable water softener ($30?)

But I wouldn’t use that portable unit. 

If heat goes out in the winter we drop off several units, so they can be placed in different parts of the house - including every room with water like kitchen and bathrooms.We also have dehumidifiers, carpet blowers, shop vacs, puddle-sucker pumps, extra hoses, extra sump pumps with battery pack, squeegees, and portable AC units ready to deploy.