[Pyros]

Gentlemen,

The trick is to first build your special building in the desired location.
Then you select a hill of 1,2,3,...,15 level and you click (in order to create that hill) in the center of the special building.
As a result of the above you will have created a tall special building.

Additionally you may fix any un-desired slope around the building with the "shift *" (this could create problems with the height of the build so you must experiment).

There is also another special technique for giving to buildings extra features but this is a different chapter!

cheers,
Pyros