Financing multiple properties to buy and hold

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I talked to my friend the other day and he told me his landlord owns 230 properties. I understand if your a millionaire it would be quite easy to attain such an amount as that. But if you weren't a millionaire, is it possible to finance that many properties to buy and hold? If so, do investors finance all of them one at a time or all at the same time. I cant imagine having 230 mortages.