It sounds as though this may be what you're looking for. In the US it can be called a plat, but you say you want something non-country-specific.

"A plat (/ˈplæt/[1] or /ˈplɑːt/[2]) in the U.S. (plan or cadastral map) is a map, drawn to scale, showing the divisions of a piece of land."
http://en.wikipedia.org/wiki/Plat

"Cadastral surveys document the boundaries of land ownership, by the production of documents, diagrams, sketches, plans (plats in USA), charts, and maps."
http://en.wikipedia.org/wiki/Cadastre#Cadastral_surveys

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Note added at 27 mins (2014-06-27 12:01:50 GMT)
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I understand. Site plan is not quite right for you, I think, since it shows not only the boundaries but a lot of detail ("building footprint, travelways, parking, drainage facilities, sanitary sewer lines, water lines, trails, lighting, and landscaping and garden elements")
http://en.wikipedia.org/wiki/Site_plan

But if it's a simpler plan of the site basically just showing the positions of the property boundaries, I think perhaps site division plan or property division plan might work. There is also site location plan, though I think this is more of a UK term.
https://www.buyaplan.co.uk/blog/posts/10-so-just-what-are-a-...

See this previous FR>EN question
http://www.proz.com/kudoz/french_to_english/real_estate/3886...