Dig deeper with knowledgeable resources but don't ask questions at the very place likely to be seeking recovery.
The market value of a 1/5 share of some place not readily or legally subdivideable for separate use may be far less than. 20% of the whole.
The current value of a well crafted long term intentionally convoluted lease purchase option may be quite low as to sale value or current income stream value.
BUT before you jump thru hoops you need to dig thru the bigger picture of all moms income and assets and Medicaid issues, inc SS ...Mom might not qualify due to other income...or assets.
The issues are full of land mines to trap you if you try to hide assets or sell them for way in adaquate amounts.
Its not my job as a taxpayer to pick up moms costs so that she can leave you an inheritance ...rules want people to address own resources first.
There. Is some wiggle room..but take care.