Help With Baked Lighting

I'm new to baked lighting. I am wondering why some of my models just come in black after the lighting is baked. Can anyone help?

See how some of the walls aren't lit, and the table in the back is just completely black ontop.

 

@stingnessz
Okay. Try the solution by Eldoryne in this topic and see if it works.
https://forum.unity.com/threads/sol...tly-black-no-light-stored-in-lightmap.379593/