The stairs up to the 5th floor have no announcement boards, but I suppose reading while walking up stairs is a bit tricky. Instead, the walls of the stairwell are decorated with paintings about the dangers of obesity and an unhealthy diet. It seems a bit strange at first; one is inclined to think that the target audience would be in the elevator and the people voluntarily taking five flights of stairs might be relatively health-conscious.
On the other hand, 'preaching to the choir' like this is probably the path of least resistance. Nothing's easier than arguing a case to people who already agree with you. There's a long discussion that could be had about this, but it's better had in person-- how else would I know how to tell people what they want to hear?
Why do I know about the paintings by the stairs? For one thing, the stairwell has large windows with a great view of the plaza below. The main reason I sometimes take the stairs, though, is that it's better than 20 seconds in a silent elevator with another person.