Just found this on another forum:
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There's another firetruck near the VCPD building in Downtown. Get arrested there, and hang a right where it starts you off after being busted. Its down the street a bit on the left.
You can start buying properties after "Shakedown" where you go to the mall and have 5 minutes to break the windows. Finish all of Diaz's missions, then it's Death Row, Rub Out, and Shakedown. After Shakedown, it tells you that you can now buy property at "certain areas of the map" but all of the places I checked you could buy right after Shakedown.
When you buy properties, you get a cash pickup outside that property after you complete missions for that property. A good first business is the strip club, its only mission is easy. Spend $600 on the stripper in the VIP room in the back. It takes a while though, so I just started it up and watched something else for a while
