Since setting up the Iray materials for this set some years ago I have learnt a lot more about PBR so with permission from www.daz3d.com/aurelio
I have updated all materials to bring them in line with proper PBR as much as I can and know how. They don't have roughness maps as I am not privy to the original source files.
I have attached two scene subsets, Day and Night and some Material presets. These are no use to anyone unless you have the original content from the DAZ3D store.
The Emissive materials have also been updated to be more realistic in Wattage and Lumen output. Be warned these will overwrite the existing Emissive presets.
The rest will be ok.PS: All the surfaces are tagged so if you want to drop the Brownstone Normal Map intensity for example you can use the Surface Selection Tool to right click on say the brownstone and select Tags, Brownstones and select All Objects. That will select all the brownstone zones in one go.