Pause game play at the startof the week and look for cars parked at treatment blocks. There will only be a couple and will save time. Mark down where you found the car parked at the treatment block and explore it the next week.
Enable the "$50,000" code and purchase several amounts of red cars. You can only buy ten at a time. Return to the car screen and sell all the cars that you bought. You can only make $2,500 back from selling them (half the money back you paid for).
Head to the Lieutenant's page of the Gang Organizer, open the Cars menu, and go to the "Black Market". Rather than clicking on the car you want and waiting for the money clip to appear, quickly drag the car of your choice from the "Black Market" page to the picture of it on the Lieutenant's side. If done fast enough, the item will be yours, with no money being subtracted. This can also be done with guns, but does not work with recruited hoods. Note: Try this first without having enough money for the object, as it takes practice. After each time this trick is used (whether successful or not), exit the "Black Market" and return.
To take out opposing gangs faster, torch their headquarters. This is much faster than bombing them. Torching kills the leader in one shot instead of twice when bombing. This may be hard if it is enclosed by other buildings. If the headquarters is enclosed, make sure you send in more than one group of hoods to torch it. Killing most of the opposing gang's hoods will also weaken their headquarters' defense.
-Extort some properties (it doesn't matter if they want to pay you the money). After that week, look on the map and double click on the property that was extorted. A picture of the owner will appear with details about the shop. Move the cursor next to the picture in the "blank space" and the cursor will change. Click when this occurs and the property will become yours. Don't forget to send a man to run the place the following week.
-To get easy properties without extortion, use do the following. Beside the picture are invisible buttons that say (in order) sack hood, return to base, and hood pay. Press the "Return To Base" button and then you own it. Doing this also (one week after the process) allows you to purchase the empty area in the middle of tenement blocks.