Once you reach Level 31, sell everything in your storage except for Hamburgers . This triggers City Advisors to offer high-priced deals for them, often far above the maximum market price.
Racing to a high level unlocks too many services (Police, Fire, Health) before you can afford them. Simcity Cheats Iphone 2015
If you are desperate for cash early on, you can demolish residential buildings and rebuild them for the initial upgrade rewards. Once you reach Level 31, sell everything in