Snow Tiger,
I just found something (by accident) that I think you might like. If
you were interested in modeling a building (or bridge) in a specific
area then you can download the terrain and then go to Components then
hit the down arrow next to the google search bar. In that list, there
is the ability to search for nearby models. Had you done that, then
(assuming it finds all models in that area) you should be able to find
out if anything had been any models made in that area. If so, you can
move on and do something else. It may not work as well as a network
link, but it should be relatively fast.