It's an old Poser asset. the photo above is obviously a city bock kitbashed from this assets and most likely a few others.
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Be aware, this is old, like 8 years old and made for Poser. In DAZ, the textures are way to high in gamma and to even do a simple test render, I had to dial my Tone Mapping down a ton. You could probably use the geometry though and just add Iray shaders to all surfaces. Not sure how much work that would be though.
TEST RENDER...
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