>Consider this: You aim to buy all 100 units, and then you can charge whatever rent you like, right? What happens is sellers discover you are doing this, and then raise their asking prices through the roof. The result is it costs you so much to get that monopoly that you cannot hope to be able to rent at a profit. Especially if it is possible to create new units for the purpose of selling at a high price to you. And it is possible, unless the government prevents new construction.

This doesn't matter to you as a buyer when the money you're spending is either borrowed, being printed out of thin air, or both.