I had wanted to build a park and it takes quite a bit
before you even break ground. You have to have a feasibility study done in order to find out if your park will be successful where you are planning to locate it. A feasibility study also decides how large the park would to be in relation to the area's population.
To build a park from scratch, it would take about two to three years of conceptual planning, design, and construction before a park is opened.
X Factor
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SFWoA: An Unofficial Guide
http://sfohio.tripod.com