I saw the mobility issue first hand with my aging parents. When my father was in hospice at home, the family/great room was converted into a bedroom.Unless I miss my guess, you have all the necessities on one level -- bedrooms, bathrooms, kitchen. That's a good arrangement for long term, if you might retire there. At some point, most of us lose a degree of mobility -- hopefully at age 103, and it sure is convenient to have everything available with no stairs, no stair lift, etc. Not something we enjoy thinking about, exactly, but a huge benefit if that time comes. I mention this to young people looking forward to building their own place. Even older friends who are entirely ambulatory like not taxing their hip and knee joints on flights of stairs.