1. Go purchase the property at the location, as soon as you do so and it goes into the mini-cutscene, hit the start button.
2. From the start menu, replay any mission, the shorter the better (Masks takes like 20 secs to complete)
3. After you finish the replayed mission, you should be back at the property with you as the owner while still having the same amount of cash that you did before you purchased it.
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