[Rippin]

By the time he retires, he'll have 5 or 6 houses or a small aprtment building.

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All this could be done just as easily if he rented the primary residence though. You are making him a real estate investor. Fine. No reason to do it with your primary residence when one is moving frequently.

[carolinalivin]

The primary residence also appreciates based upon the leveraged amount and it provides additional tas reductions over investment properties. The gain in appreciation can usually outrun the cost depending on where you live. There is no dividend on rent.