Monopoly Tycoon/Walkthrough

Starting Out
The first non-tutorial level is kind of a sandbox. You can construct any Retail or Residential building, although you cannot yet lease blocks (and you therefore cannot build Landscape), and the goal is straightforward on any difficutly setting.

A Homely City
This time you will need to construct both Retail and Residential buildings, but the lack of opposition makes this as easy as the previous level.

Compete for Sales
Now the going gets rough. Build anything that has a chance to attract customer, set the prices to as low a value as you want, and keep building while ignoring the negative "cash on hand" values you reach. The goal is to sell more, not to have more money.

$3000 Daily Profit
This is the last "easy" level - meaning that it can be beaten on "hard" difficulty without much stress, even though the competition has doubled in size. If you don't want to use the RR strategy mentioned in the main article, just set the prices right - so that you get nice profits and lots of customers for as many businesses as possible, and then lease some blocks, buy out their profitable buildings, and watch the money rolling in.

First to be Worth $20000
In this level, things get very tricky. One piece of advice is to not auction too much, since this will block your money, allowing the competition to wheez by you towards the goal.

Greatest Empire Value by 1945
Remember that the target is "the beginning of the year 1945" - so you only have two game days to outwit the three competitors.

First to be Mayor
This level is actually pretty easy: you can ensure that you get most of your citizens' votes by leasing one or more properties and beautifying them.

Sell, Sell, Sell!
One tactic for the final part of this level, when you've already sold 1,500 - 2,000 units, is to set the prices for all your businesses as low as possible (10 cents apiece), and see the numbers rush up. :-)

Note that you cannot use this alone, since the negative limit for your cash is -$10,000, and within this limit i was able to sell only 2,000 units in the first two days (before i went bankrupt).

Last Man Standing
You can probably employ the same tactic as in "First to be Mayor".