One other thing came to mind when you mentioned this...
Some cities, especially smaller towns, can waive fees or lessen them in exchange for something that will either increase their tax basis or improve the community as part of the broader city. So basically if you can make an argument that any money they waive from the connection or impact fees will be applied to something at the Park then there could be dual benefit.
For a turnaround Park I had under contract was looking at the cost to move from master meter to individual meters - the town was going to waive 75% of the individual water meter connection fees (3K for each meter) in exchange for addressing all of the code violations (~75 violations over 5 years) and could perform over 6 months with no new violations.
You just need to figure out the levers that influence the city and it could be a way for you to lessen the cost of infrastructure and put that money instead towards tangible improvements that can better position your Park for future rent increases.