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Perhaps I can't get 20d because I have 22a wrong.

While nowhere to be seen, I take seat in building (2,8)

I have IN ABSENTIA. I think it must be an anagram of something, but I can't see where the B comes from. Any explanation or correction please?

IN ABSENTIA is correct (I NAB plus anagram of SEATIN).
I'm also stuck on 20D, my last one

Me too! Just can't see it

Thanks simond9x
That's a bit left field! (NAB = TAKE I assume). There were a couple of others I thought weren't good clues too - 7d especially.