The bench is a corridor item. It is a place for Peeps to sit, although they would probably prefer the Plaza fountain. It can be placed on all three decks, although in can only be built on the sub level and pleasure deck, it can be teleported up to the bio deck.

It appears that benchs have no actual use in startopia, no peeps appear to sit on them and there is no code regarding mood changes for using them.

It is possible that they are included in the generic furniture bonus that gives peeps a small (+1) one off boost to mind and soul points when they encounter a piece of furniture.