Mesh colliders not working on FBX imported buildings

OK, so my 3D character runs through some of my buildings but I did the mesh the same way I did the other ones that work. What should the settings be at for the colliders to work? I have the generate colliders checked on all of them but it doesnt seem to be working.

Nevermind, I figured it out. I had to make a new collider with the -component-physics-mesh collider- option. then I loaded the mesh I had in the prefab onto the new collider. Works perfect for me now.