the bark is actually what makes me think it's a Chinese elm. C. Elm (ulmus parvifolia) is also known and sold by landscape nurseries as "lacebark elm" as the bark exfoliates in attractive irregular patterns like this.
A mature Chinese elm in a landscape is very striking, even though we're used to seeing it as bonsai. There are quite a few in neighborhoods around here in N.Va. Some are even used as roadside trees because they're so tough.
rockm, you definitely got it! i checked out the links you posted and its spot on. we have 4 huge ones at work and a couple that have sprouted near them and the landscapers were about to dig them up last week. The best part is they have a 3" base and good taper. So i checked with my boss to see if i could take them and he had no problems with that. Do you have any collecting tip for these?
You can probably dig the thing out, trunk chop it, remove most of the roots (keep a few feeders if you can close in towards the trunk--these usually have a few thinner ropy roots that can be wound into a pot after collection), bareroot it of all soil (using a hose) and put it in a growing container with bonsai soil.
Chinese elm, like most elms, are very tough customers and vigorous. I don't think you will have any problem with re-rooting one of these that's been in the ground. It will have a lot of stored energy to push new growth with.