New version with unity5 pbr materials. This is a manor construction kit, consisting of hundreds prefabs (rooms, halls, gallery, corridors, stairs, cellars, exteriors), textures (color, normal, cookie) and related materials (wood, marble, stucco, doors, window glass, furniture, bricks, stones, roof, wallpapers and parquets) and two sample scene.

You can use this to create many configurations of interiors, suitable for use in any number of genres, including RPG, FPS, survival horror games or other types that require an elegant mansion with dungeon cellar.
hundreds of premade blocks for corridors, rooms, hall, cellars, attic and exteriors
Textures 2048x2048 albedo, normal, normal fine, specular and occlusion
6 kind of door with a script to interact with them with F key

It is compatible with: - Generic Modular Modern Construction Kit
- Grid-Based Dungeon kit 2

All screenshots were taken with Unity (free), so things can look even better if you have Unity Pro!

Official discussion