You might try posting your question at the forum topic for LEED-ND projects:
http://www.leeduser.com/topic/leed-neighborhood-development-leed-nd-forum
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David Posada
Integrated Design & LEED SpecialistSERA Architects
LEEDuser Expert
1980 thumbs up
November 29, 2011 - 1:30 pm
Hit return before I was finished...
As you probably found, LEED NC won't apply to just the play area and park if there are no buildings that are conditioned and occupied enough to meet the FTE requirements in the Minimum Program Requirements (MPRs) of LEED NC.
You might start with the introductary chapters to the ND Rating System, especially "When to use LEED ND."
If you are involved in ongoing green management of the buildings on this whole site, you might consider using LEED EB O&M, since this will also address exterior landscape maintenance.
You can also get help deciding if you start to register a project on LEED Online and go through the beginning steps - it will walk you through a set of questions on selecting a rating system if you choose "I'm not sure which rating system to use." You don't need to pay if you are not going to finish the whole registration process.