How do I reserve a building for my son's party?

I think this link should help you out. JaxParks - Parks and Reservations https://jaxparks.coj.net/login.aspx

Whats crazy is I've never known anyone having a party up there say anything about a reservation. Yeah I guess check with the cities parks and planning

Lorenzo has the online website. You could also call the city's Parks and Recreation number to speak with someone about reservations. (904) 630-CITY.