How to achieve better realism

Hello!
I am very new to the modeling and world building abilities with Unity. As a learning experience, I took on the task of completing construction of a local office building in 3D using 3DSMAX and Unity built in tools as well as some free assets from the store. I enjoyed the process immensely! However, I believe I have hit the end of my untrained ability and would love some pointers. I am looking to get to the next level of realism in my model. This model is being temporarily hosted at http://www.carpet-cleaning-in-orlando.com/unity/Unity.html
If anyone has any pointers I would love to hear them! I am a total newbie to this so any advice will be good advice! Thanks!

 

There are some great tutorials available, maybe try:
https://unity3d.com/learn/tutorials/modules/beginner/graphics

 

1. You need shadows from your light source
2. Materials with bump (nothing in the real world is without bump)
3. Imperfection is a key element to realism -> give your 3D model not 100% strait lines and crack some corners. Have a look onto the real world version of your building. maybe there are some parts that are damaged by storms.
4. Bake Ambient Occlusion & use dirt maps on your Textures.

These are some points i think would dramatically increase the realism in your scene.

 

Thank you for the specific ideas!

 

Thanks for the direction!