[quote=Charlie]
Would there be any lab runes left?
[/quote]

To some degree yes. The entire city is built upon them. If you look at some of the art you can see concrete barriers, or chunks of wall, and for the most part they have been reused to build the homes and shops of Urbi Lupi. As far as a fully intact building goes, not likely. From my research no modern building would last anywhere near 2,000+ years. The ones that would survive surprisingly are the ancient ones that have already survived 2,000+ years and will do so again, like pyramids.