Create building from polygon in XNA 4.0

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C#

C#4.0

XNA

Hi,

I would like to ask your help in the following problem.
I'm creating a desktop (Winform) game application in XNA. I have a collection of points what I use to draw a polygon.
I would like to use this polygon to draw a building on the game level.
My question is how should I draw this building from a 2D polygon? The building height will change randomly.
I tried to use http://www.riemers.net/eng/Tutorials/XNA/Csharp/Series2/Creating_the_3D_city.php[^], but this tutorial use fixed position and side number.
Does anyone have any idea how should I solve this problem?

Thanks for your help!
Sparrow