Sorry, still confused: what do you mean by "wrap up questions please"?  The area figures for the downloadable documents (at least older versions, which I have on my hard drive; they've substantially revamped the documents recently, so this may or may not have changed) from NPS omit the decimal points from the area figures, and if you don't realise that, you're going to think that the areas are ten times the size that they are.  NPS documentation discusses the issue, but you won't realise it from just looking at the database.  For more details (which, again, may not apply to the current version of the database), you can read the final full section at Wikipedia talk:WikiProject National Register of Historic Places/Archive 31, which is where we first became aware of the issue.  If you go there, you'll see that a major participant in the discussion is  — he's the one who runs www2.elkman.net, so he's been careful to make corrections when problems such as this one come up.