Mike -
An old neighbour of mine had propogated a bunch of things, and he made a gift of this to me. A native of Mexico apparently, he said it could be spelled Sapote or Zapote. A quick grower too - in about two years it is over 10', but is like a beanpole, and has not starting spreading out yet.
I am imagining a patch of "moist, well drained soil, under dappled sunlight" That would be a better selling point for the house than any number of bedrooms and bathrooms.
Cheers,
Mike