Model LOD Cutoff Problem

Hi, I’m having trouble with an Incredibly Large Model, It Loads in hammer but I can’t see the model unless I get close to the midpoint of the model. Is this the model or hammer? and how can I fix it?

You have to get at a certain angle to see it or else you can’t. I don’t think you can remove the blocks though. You can see it clearly, when you load the map in HL2. Also, I think this goes in the mapping section.

Er the model most likely can’t load in HL2 because it was compiled for EP1 and saved in EP2. There’s no way to fix this? because I Need to be able to see it in hammer to give it collision by brushes.