At the front doors there are no stairs, it's a gentle climb towards the front door. On the site's seating legend for both the Jewel Box Theater and The Centre Stage it specifies which seats are wheelchair accessible, and which are wheelchair companion seats. It might be useful to note that as there are no ramps, the wheelchair accessible seats are near the last row of seats.
Back row has seating options
Great wheel chair access
They have great wheel chair access to the building and open spaces for wheel chair seating.
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