The difference in actual material wealth between the rich and the poor isn't that excessive today. Beyond a certain threshold you're only buying novelty. And the gap is shrinking every year.
Edit: money kind of represents a debt society owes to the individual. By owning the most money, it actually means that society is most indebted to them, or that they have loaned that many resources/value to society which has not yet been paid back, ironically enough.
You buy $1bn of commercial real estate you get $100m/y to maintain the upkeep in rent. You will be able to get line of credit to cover you for unexpected expense.
You could do that of course. But then you probably don't actually own the resource directly. You probably own the company in the form of shares, similar to money, another tradable token.
You're certainly not using the real estate for yourself like the comment we were replying to was saying. Indeed, if it's being leased then it's probably being used entirely by others!