Here is a huge pack of grim architecture details and other different assets which you can use to make your own grim environment. All main textures is 4k and inklude all what you need for PBR rendering.
This package is a part of Architecture bundle (save 50%)
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Technical Details
Number of Unique Meshes: 159
Triangle counts: from 2 to 17200
Collision: no
LODs: no
Number of Materials and Material Instances: 18
Number of Textures: 54
Texture Resolutions: from 2k to 8k for different objects
Supported Development Platforms:
Windows: Yes
Mac: Yes