I then explain that just like someone in, say, a wheelchair asks for an accommodation, maybe a ramp to get into the house, I can allow that. 

If you explain about the possibility of two guys with steel pipes jumping out of the bushes the year after next and putting him in a wheelchair with a brain injury and a colostomy bag to crap in for the rest of his short life, he might still not get it.

Regardless of how we feel about this loophole, behavior that could be considered discriminatory against this tenant is legally on the same level of having a "white only" or "no wheelchair access" in your advertisements. 

Our contingency on our offer was to evict the first-floor tenants to owner-occupy the first floor, as I use a wheelchair.

As people don't need to disclose that they use a wheelchair or cane, they also don't need to disclose a working dog.

Using phrases like ADA compliant, wheelchair accessible etc. is usually fine.  

We added a new metal roof since the carport showed signs of past leaking, new vinyl plank everywhere, new paint, gutted the kitchen, added new appliances and new cabinets, added beadboard panelling to the kitchen and one bedroom to cover up some old wallpaper, new baseboards, replaced all wood windows with vinyl, new carport ceiling, new wheelchair ramp.

We added the 3rd bedroom back as a wall had been taken out decades ago to convert it to a 2-bedroom; added a new metal roof since the carport showed signs of past leaking, new vinyl plank everywhere, new paint, gutted the kitchen, added new appliances and new cabinets, added beadboard panelling to the kitchen and one bedroom to cover up some old wallpaper, new baseboards, replaced all wood windows with vinyl, new carport ceiling, new wheelchair ramp.What was the outcome?

The current tenant is qualified only for a 2 bedroom as of now but says she can get qualified for a 3 bedroom since she has lots of equipment (wheelchair, etc.).

No structural changes need to be made to your property for these individuals such as (wheel chair accessibility, ramps, sprinkling systems etc.