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When can you use existing real estate as collateral to buy more?
Generally, when you own something - you can give it as a collateral for a secured loan. That's how car loans work and that's how mortgages work. Your "equity" in the asset is the current fair value of the asset minus all your obligations secured by it. So if you own a property free and clear, you have 100% of its fair market value as your equity. When you mortgage your property, banks will usually use some percentage loan-to-value to ensure they're not giving you more than your equity now or in a foreseeable future. Depending on the type and length of the loan, the LTV percentage varies between 65% and 95%. Before the market crash in 2008 you could even get more than 100% LTV, but not anymore. For investment the LTV will typically be lower than for primary residence, and the rates higher. I don't want to confuse you with down-payments and deposits as it doesn't matter (unless you're in Australia, apparently). So, as an example, assume you have an apartment you rent out, which you own free and clear. Lets assume its current FMV is $100K. You go to a bank and mortgage the apartment for a loan (get a loan secured by that apartment) at 65% LTV (typical for condos for investment). You got yourself $65K to buy another unit free and clear. You now have 2 apartments with FMV $165K, your equity $100K and your liability $65K. Mortgaging the new unit at the same 65% LTV will yield you another $42K loan - you may buy a third unit with this money. Your equity remains constant when you take the loan and invest it in the new purchase, but the FMV of your assets grows, as does the liability secured by them. But while the mortgage has fixed interest rate (usually, not always), the assets appreciate at different rates. Now, lets be optimistic and assume, for the sake of simplicity of the example, that in 2 years, your $100K condo is worth $200K. Voila, you can take another $65K loan on it. The cycle goes on. That's how your grandfather did it.