Hm! I think once you get yourself in the bad books of anyone, you STAY in their bad books!
If you have the quest in your quest book, though, from BEFORE you got in bad with them, you MAY be able to try going to the person you got the quest from, with the item. You should still get the quest points, if he will take it, but the people in the building will still be red and attack you.
Try it and see!
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