Besides for owning the land outright, these people (your neighbors) would also have equity in the water well, septic, transformer, landscaping, and any other site improvements. Don't they also own the mobile which is being retired ? They would certainly appear to have equity sufficient to satisfy the 80/20 criteria.
Something's not computing quite right.
I just missed out on a Commission because a local Professor got Tenure at a local College here and then decided that though he wanted to stay in the neighborhood where he owned a Doublewide (on a slab), he determined that it was no longer up to the standards of his station in life.
After working with him for a few months, he decided that instead of buying another house through me, he would get a construction loan, dig a hole on his existing lot, pour a foundation for a full basement, and plop a New Two Story Colonial Modular on it; which he tied into the same water, sewer, and all the other utilities as had serviced the Old Doublewide.
Then he traded in the Old Doublewide for $11,000, and got a new conventional 30 year Mortgage on the New Colonial. The Old Doublewiide was dragged away, (like an old cast off shoe) to become someone else's new home in a different location.
And the Professor is happy in his same Old Neighborhood, with the same Old Lawn and same Old Bushes and same Old People (aka Neighbors). I goot a little consulting fee out of the deal (plus rights to tell this story).
Your Friends/Neighbors should be able to pull off something similar.
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"