Group of elevators in a building
A 'bank' of elevators is what I've seen in literature and heard spoken. So far as I know, elevators were not hunted 500 years ago or thereabouts, so you're not likely to find a classical term of venery. That opens the door for making your own term up, as appropriate and understandable ("a Stonehenge of lifts") in context, but if you're going for immediately recognizable, 'a bank of elevators' is in common use. See the Wikipedia elevator entry for multiple instances, but a web search will reveal the prevalence of the term.