Something similar to this was brought up, developed, and sent to the devs and now has a label of
Planned ; that thread is
here
Note the last post in that thread: this is probably a longer term 'planned' than we'd like. Apparently there are performance issues involved, but at least they like the idea.
In the meantime, have you found
ElvenStats where you can import your city to
ElvenArchitect and work with your bldgs/space there? Those are both player-maintained sites, so you'll still have to re-do your city manually, but it helps.