HQ Abandoned School - it's a completely modular flexible set of 3D-models, textures, materials and shaders that will let you dive into an atmoshpheric abandoned place of the previous century.
This pack is available at Unity Asset Store: http://u3d.as/12aN
and will be available at the UE4 Marketplace soon.
The interior of the building made of modular pieces, so the end user can build any layouts.
The lite version of Object Placement Tool is included in this pack. This tool allows you to quickly populate scenes with the big number of different objects. For example, all these books on the floor have been distributed using this tool http://u3d.as/WBU
Included substance materials give an ability to customize walls, floors and, for the moment, student desks. You can adjust colors, dirtiness, size of the tile etc.
HQ Abandoned School (Modular) | Unity