ok i dont know wtf is going with compiling tool but i think this is the first time ... some faces mising from building ... how to fix that ... and this is after compiling in radiat looks perfect ... i did not use decail just caulk and stone texture.

When I mapped for cod2 I too had walls (from brushes) disappear ingame. What I would look for in radiant is for brushes that are overlapping adjacent brushes. Check to make sure that all brushes are flush with each other.

Ray writes...
no overlapping ... im 100% sure...

i fix this ... i delete that building and replace with same building on right in picture and it looks fine now.

glad you got the problem sorted , for future reference this error may manifest itself somewhere during the compile , always worth checking the log for any errors

im probably teaching granny to suck egss and im sorry if thats the case but an error like this , especially witth errors with brush work , it may be an error with somthing like a "node without a volume error" or somthing similar

but any errors are always worth learning how to fix and sometimes posting your compile log can be more revealing than a screen shot