I wanted a closer arena

Welcome to the forum!

If this is a single family private residential property, then it is ineligible.

If it is not SFPRP, then you would still have to explain how it meets any of the criteria of a great place to exercise, explore, or be social. Simply being a nice spot where you would like to have a Pokestop is not enough.

You can read through all the criteria here:

I think I found the location, and it doesn’t look like it is single family if this is it, so I will leave this for others to help you determine if it is possible to resubmit with an improved submission.