Hehe my post ! Yes you have to find one , go straight up to the tower/office building main door , click Windows key and it will show you "Knock on door" or "buy property" , if it's the first part then you can't buy it as long as it has already been bought , if it's the 2nd part thought , then you can buy it , a gang base in 10 mil pounds by the way and it will require some upgrades.