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I just completed the game. Here are a few tips. First, there are only 3 cities you will be building in if you are wondering how long the game is. Second, it is better to assign cleaners and guards to specific floors. Third, upgrade the booths to reduce the chance of being robbed AND to reduce electrical problems. This will allow you to only need a few Technicians which should be set to any. Fourth, build elevators so each one only reaches 2 floors, and use two columns for placing the elevators to create a step-like formation up the building. Fifth, you should not need more than 8 floors for any of the missions, including the New York City one requiring $250,000 profit in one day. In fact, having more than 8 floors will start losing you money as shoppers will spend more time traveling than actually going to a store. Enjoy the game!