as the entrance is made mostly from glass, i needed to produce the inside aswell, for the time being, i made the model see-through, i did this by pressing alt+x.

I then created the stairs using a stair tool, i then scaled it to teh correct size and fitted it inside the cylider part of the buolding, i also added a flat box whihc would represent the 1st floor, giving me an idea of how high the stairs needed to be.