Thanks all, And many apologies; I think I sent an old copy of the file that had been previously-cached. I have run the JOSM validator on the complete building set and removed the multipolygon weirdness, including the overlaps Andrew noticed. I also orthogonalized the full set, though this required manual revision of some buildings.
I did a test import of about 40 buildings at this location (my own neighborhood): http://www.openstreetmap.org/?lat=44.51239&lon=-73.24811&zoom=17&layers=M Let me know if there are any objections to me proceeding with the entire city. Thanks to everyone for your input! -Bill
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