After reading about the WOFATI concepts, I got excited. I am on a North Facing slope and thought this might be tailored perfectly for my property of 5+ acres.
Its a big Coast Live Oak in the pic. Would like to build 2 200 sqft earth shelters separated by 300ish sqft of courtyard. Complemented nicely by the teracing etc up hill from the "village". This location is about 300' out the backside of the home to the east. Right now almost the whole thing could fit under the oaks canopy.
Assuming the oak has a big tap root and grading could be done without destroying the tree, this would be a great place to have guest quarters and a homeschool classroom etc.
Location Valley Center California (unincorporated San Diego County)
Under the tree
Up the hill due south
Down and north