Then do as Treelooker suggests, cut it back to the closest growth point so as to give maximum distance between rot entry point and main stem...as others have also suggested, too.
I'd pass on the birdhouse idea, though :D. Won't do a thing to protect that wound. I think open exposure is better.
Walk away, it'll do fine.
Treelooker and I have a different opinion...he's probably more correct for how to treat these wimp urban trees :).
JK, well a little :D.
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