I don't know if they're grungy enough for you but dreamlandmodels has city blocks over at daz that are poser compatible. Each block has 4 sides so you have 4 sets of buildings.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10