There is a tall building in the south of the house, Feng Shui.

Stairs don't have much influence, mainly 2. If there is only one tall building in the south of your house, and the houses around the tall building are very low, then there is a problem. In geomantic omen, it is called "lone peak evil spirit", which is a disaster to neighboring buildings. The solution is to put higher herbs on the windowsill facing the tall building!