It is a public park anyone can use it (and I can personally attest to the fact the ziplines in the playground will hold the weight of a fully grown adult..... ;-)). Truman foot the bill to build it, as is standard for any developer to do in a new greenfield community, Truman just chose to go a little higher end/innovative than normal. And that took a LOT of convincing at the City to be allowed to do that from what I understand. There is an HOA for West District, but I am not sure how much of the parks maintenance is covered by those fees, vs. just normal City operations.