The Fillmore – Philadelphia
There is only street parking.
It's flat to get from the street to the venue. There are stairs to get to the balcony/other levels, but there is also an elevator.
From the website: "The Fillmore Philadelphia offers ADA seating and additional accommodations (as needed) for those with disabilities. To inquire in advance, please contact the box office directly for further details. To inquire on-site/upon arrival, please arrive as early as possible to speak to a Guest Services or Box Office representative for further assistance."
There are stairs and an elevator to the balcony and it has seating in both stadium style seats and barstools with tables. For some events, the balcony is closed to VIPs only.