Go to the team color select screen and put in one of the following codes then press ENTER. You will hear a sound if entered correctly. Repeat for other cheats. Now during gameplay press C to toggle cheats on/off

speed364 Faster play in Network Game
worker928 Get workers all times
pickup036 Be able to pick up enemy beacons
weapons563 Able to Buy any Gangster Weapon
tenants872 Be able to pick any tenant
loans458 Borrow any Amount from Bank
estates216 Buy any estate without limits
houses462 Get all houses
gadgets213 All gadgets
maps029 All areas
upgrade934 Fast upgrades