How can you own golf courses and buildings around the world and only have a networth in the hundreds of millions?
When you owe the bank hundreds of dollars, the bank owns you.
When you owe the bank hundreds of millions of dollars, you own the bank.
If you learn about the real estate market - all over the world - leverage is the key. You don't have to have the money yourself, you get banks (and other institutions) to loan you the money.