“The width of the elevator car is a minimum of 80 inches (2030 mm). The depth of the elevator car measured from the back wall to the elevator door is a minimum of 54 inches (1370 mm). The depth of the elevator car measured from the back wall to the control panel is a minimum of 51 inches (1291 mm).”
My point is exactly that the ADA, in this case, lets the perfect (fully accessible elevator) result in worse outcomes (brand new apartments in 3-5 story buildings require walking up stairs). This is especially harmful in cities where many homes are on small, 12-20 ft wide lots.
As an example I know people who had to move out of their home when they tore their ACL, whereas with a small elevator they would not need to. To be clear I think we need many many more ADA-accessible apartments, but wherever you are allowed to not have an elevator at all, you should also be allowed to have a small 1-2 person elevator in addition to the stairs.
In Spain and France you’ll find single staircase, 4 story buildings that have one meter-by-meter sized elevator. Often even as retrofits in older buildings! In NY you’ll find these too, but they’re only in pre-war (1930s and older) buildings. It would make many apartments much more accessible and desirable to live in if we could drive down the cost of elevator installations for smaller buildings.