This is a classic estate building with a detailed interior for Blender Eevee and cycles.
Everything in the scene is originally designed and modeled.
The entire building is developed in a modular way. (3x3x5grid)
It is easy to swap out a wall part for a door part. Or move interior walls around.
These modular parts are all instanced in blender. So they use relatively low memory and performance.
This scene is designed and optimized around Eevee. all the lighting and reflections are baked in by using a irradiance volume and reflection cubes.
(The polycount and object count might seem high, but by using instances the performance and memory use is very optimized.)
• Objects: 4424 (2000 objects is a bush particle system)
• Vertices: 1,986,918
• Edges: 4,023,586
• Faces: 1,981,976
• Triangles: 4,015,679