So the places we all encounter that don't even have a wheelchair ramp at the entrance (at the appropriate incline, etc), even though it would be relatively easy to put in, aren't compliant (envision a storefront set back 10 feet from the sidewalk).

Grandma & Grandpa could have their wheelchairs handy to get down the hall to see the grandkids.

Built porch floor, wheelchair ramp for the future maybe.  

I have a middle aged guy with a disabled son (wheelchair) who wants to move in our unit.

The tenant while living in the home had one family member who became wheelchair bound during their occupancy.

Also we plan to have the ADUs handicap/wheelchair accessible on the first floor.

I have a property with a concrete wheelchair ramp. figured someone would love this. 

They would need to make "improvements" to the property, wheel chair ramp, handicap accessible showers, etc.

In CA:  I have a tenant who, all of a sudden is in a wheelchair. 

Wide doorways to accommodate walkers and wheel chairs, a floating sink in the bathroom, a walk in shower, grab bars, etc.