4500sf Main House … 20’ to 30’ from house is a pool, heater and other equipment
Then about 50’ on other side of pool is a detached guest house (with 2 bedroom, 2 bath, kitchen, 7 car garage, etc)
Only 1 electric meter for everything. Guest House has a 100amp panel fed from main house panel (200 amp). And another 100amp sub-panel at main house.
Outside house is a back up generator with 65 amp breaker for it.
A detached barn or garage YES, but can you run another house off the main house panel.