Walking Up Inside An Office Stairway

Door to stairwell opens and closes and someone walks up two sets of stairs, the first one slighty faster than the second. Then another door is opened and the walker enters an office where music is playing very softly and there's a bit of an office din. The office portion can also sound like entering a hotel lobby or outer waiting area of a symphony orchestra concert. The stairwell is concrete and metal. It's very echo-y. Recorded on a samsung galaxy s3.