Build on Unbuildable Blocks
This glitch will enable you to build businesses on the Railroads and Utilities.
First, obtain the lease on two blocks; a normal block and an unbuildable one, such as a railroad or utility. Click on the normal block and click on the "Build" icon. The game will ask you if you want to activate building rights. Now, click on the railroad or utility and it will ask you if you want to activate building rights for it. Say yes, and you can build on the normally unbuildable block. If you want to build more, you have to click on the normal block again so it asks you if you want to activate building rights. Then page over to the block you just built on. This is great in the "Race for Mayor" and "Last Man Standing" scenarios because you can landscape an entire railroad or utility without losing space to build your business empire.
Megapolitan bonus scenario
Finish all scenarios with any character. After the ending sequence, you be given a new scenario to build a Megapolitan. You will have $200,000,000 to build it, with no rival leaving you free to build your own city.
Win auctions
Start an auction. Immediately save the game when the auction screen appears. Quit the game and reload your saved game. Almost all of the time, the CPU players will pullout of the auction, allowing you to get the property for the cheapest price. If this does not happen, reload the game and try again.