Thx, sry for the late Response. It is tricky sometimes with the controller. In my games i solved that with placing a cube on the stairs and scale it over them a bit to get a more flat surface. Then just turn the mesh renderer off and use only the collider of the cube.

Thx for the Feedback. I checked the building today and i found out what you guys maybe mean with doors cant be open. I already made a code that rotate the doors by checking and un-checking the "Door Bool" on the Door Mech script that is on all doors. You just have to put the correct Rotation values into the code component on each door, and i forgot to uncheck the static checkbox on the doors. Static objects cant rotate, so just select the door and uncheck the little static checkbox in the right upper corner of your inspector and you should be able to rotate or animate every door.

Thats not true!