It's extremely common in an office building I used to work in. The office has 21 floors and people shuffle between them often. Going up or down 1 or 2 floors th

It's extremely common in an office building I used to work in. The office has 21 floors and people shuffle between them often. Going up or down 1 or 2 floors there are stairs. Also the top 11 floors use different elevators than the bottom 11. They share 1 floor so you can switch