Though he might not have exactly what you look... there's a contender coming up in the 'ranks' to challenge Stonemason...

Look at Predatron's work, here, at content paradise, his own site (google the name), poserpros, 3dcommune, and elsewhere.

Pretty impressive. The two combined will give us all some really nice high detail backdrops.

poserworld might also have something - they have a very large library of urban scenes.

Truth has no value without backing by unfounded belief.
Renderosity Gallery