It's insanely humble by billionaire standards. Any FAANG SWE over 30 or so in the United States can get that. Contrast with multiple compounds, entire islands, etc.
> Any FAANG SWE
That is so few people.
So, so, few people.
Rough lookup says less than 150,000 people in the US, or 0.044% of the US population.
Not the daily FAANG SWE injection
Buffet surely made lots of upgrades and has added plenty of material comforts.
But it is quite possible to be a kind of lazy where even 10-20x current wealth, people would live where they currently live. American neighborhoods are reasonable that way. It is just primary home and they would holiday/vacation wherever.