I over built my arena when I started before I understood how it worked, but as a consequence it has allowed me to observe areas that seem to cap out (because I can't really sell them out bleachers).
Generally you won't sell more than 23,000 even in big games, my biggest crowds have been around 23,500 when playing in a final.
You will have 550 of your top two types of seats, so the question becomes what to do with the other 22,000 to 23,000 seats.
I have 6,600 Lower Tier, I get close to selling that out in bigger games but I have plenty of space in pricing, so I would suggest at most 6,000 to 7,000 Lower tier seats, which leaves you aiming for about 15,000ish Bleachers.
If I was starting over now I think I would aim for a final build of 16,000 bleachers, 7,000 Lower Tier, 500 Courtside and 50 corporate boxes and then, as previously stated, adjust the pricing to try to ensure I'm selling roughly 90-95% of each category most weeks.