people are sitting on a bench in front of buildings.
Two coworkers eat lunch on a bench outside of their building.
We have no idea if they are two or more people, we have no idea if they are coworkers or not, they could be anyone. We have no idea if they eat lunch on the bench or what they are doing, they could be doing a number of things.
The two people may not be coworkers, may not be eating lunch, and the building may not be theirs.
People are not necessarily coworkers or eating lunch just because sitting on a bench.