This house for sale is supposed to be the world’s most expensive and it only has three bedrooms (It has plenty of other accomodation for staff etc though) . You’d need $175m. It’s on the daily mail website.
It’s in Wyoming which has no state income tax or estate tax.
The ranch is called Jackson Land and Cattle and has it’s own website where you can discover more about the place.
The estate agent listing is here 1,750± acre.There is a three-bedroom home, a four-bedroom guest/bunkhouse and two employee apartments on the property.