It's a very advanced programe and probably not that well suited to Beginners.
It's free to download from:This new BAT will provide ALOT more possibilities than the comparitively primative SC3K version, but at a cost. Gmax is a watered down version of 3D studio max from which the BAT will be based off. If you're not familiar with the BAT, what it basically allows you to do is design and make your own buildings and import them into your game.Not too many details are known yet, but you can get a headstart on practicing with the design tools by downloading Gmax.
Design your own buildings!That's right! SimCity's BAT (Building Architect Tool) is going to be introduced into SimCity 4.