Here are my 3D models of several buildings and 2 city models used in Imperial Splendour - Rise of the Republic. In total 77 models are in the .zip file. However note that this is only a resource you can use in your own mods. I added my UI too, you can use it too, or create your own.
If you use these models in your mods you need to give me accreditation (such as: "building models made by Quintus Hortensius Hortalus").
I have a blog where I present some of the models with 3D previews.
Furthermore some screenshot of some (not all) models:
Some in-game examples
Download the .zip file here