Since you are in Div III you can upgrade any of the above and see some gain from it.
Your prices should be adjusted up.
Here is what I suggest:
Bleachers: 6500 seats. $13 price. No change.
Lower: 850 (adding 350) $48 price $245,000
Court: 225 (adding 175) $125 price $350,000
Luxury 10 (adding 9) $1,000 price $144,000