if you 'mouse-over' an AREAL3D-building, there are some options
for modifying a building in the context menu:
- building parameters
- update a building
- direction of the modifier
- type : add / remove floors or move
- some more options
- the view block with mamy global functions
- naming options

You can also directly modify the building via arrow-keys (floor-height and amount
and vcb (floors).