He entered by a rear door in the basement and used the service stairs.

It was dark when he climbed other service stairs from the cellar of another building.

He raced down the service stairs, taking them two at a time.

The service stairs that led to the kitchen were also heavily guarded.

A service stair is nearby, running from the basement to the third floor.

He ran down the service stairs to the next landing.

Jerry went up by the service stairs, found 805 and knocked on the door.

It was a long walk down the service stairs and out of the hotel.

He raced silently up the service stairs to the top floor.

You take the service stairs and start working through below.