DOS cheats
To use these cheats you have to use the DOS version of the game, but that doesn't really matter. To activate them go to the single-player or network-player selection screen and type the desired cheat followed by Return; make sure there are no spaces and that you can't see what you are typing, you'll hear a beep if you've entered them successfully. Enter the game, press C, and a + sign should appear beside the date. This means the cheat mode is activated. Now type:

speed471	Speed up network play
worker902	Buy workers whenever you want 
gangster822	Convert workers into gangsters whenever you want
weapons473	Buy any weapon for the gangster
tenents127	Select any tenant at any time
fences673	Build any fence whenever you want 
loans039	Borrow any amount of money from the bank
estates131	Buy any estate without limits 
houses738	Select any house at anytime 
build909	Place houses and hit Ctrl to build instantly
actions674	Use all undesirable actions on easy level
gadgets337	Build every gadget 
missions824	Use Alt-I to toggle missions off 
complain840	Use Alt-C to turn complaints off 
cadets552	Use Alt-P and Alt-M to supply police cadets and mob bribes
teams418	Change your teams in single-player mode 
map751	Play any map with any number of players