You can download the demo of this game here (for PC) or here (for Mac).
Before clicking anything else, select a lobby and using the scroll bars, go to the bottom most left side of the screen and click once. You'll pick up a big 4 million.
For the first lobby, press:
CTRL + left mouse button for a double decker lobby, or
CTRL + shift + left mouse button for a triple decker lobby.
I've found a great SimTower page. Click here to enter the Vertical Empire.