The office he worked at was on the fifth floor, and after a few minutes he reached the landing to the fifth floor.
There was a window directly to his right, and one to his left. They were not transparent, but were translucent with a mosaic pattern upon them; so the one to the left allowed in a blurred ray of sunlight into the otherwise unlit corridor. Beside each window was a door, both facing each other, side exits to the offices on either side of the hall and elevator. Facing the elevator door for a moment, he continued down the hallway, which was directly to its right. A few paces and he arrived outside the two main entrances to the offices.
Entering the building, he went straight for the elevator. Just like the bus, it was improbable he would be able to get a place, not that it mattered to him, and so after a brief glance to see if there was room to accommodate himself, and seeing that there was no such room, he headed up the stairs. They were similar to spiral stairs, except that they only turned 180 degrees before reaching the next landing, and continued in this fashion up until the roof. Of course he had never been up to the roof, never daring to go beyond the seventh or eighth floors.