Lighting nonexistent when import COD Map

Hello,
I am attempting to use an exported Call of Duty Black Ops 2 map in UE4 but I can’t get realistic lighting or shadows with the map. I have added a directional light and skylight and have tried to get realistic lighting many times but can never succeed. Even with these, the map seems almost unlit. Hopefully someone here can help.

Here are my current settings

313958-light5.png