Sorry, gonna have to inject my two cents worth here!  If "someone" wants
new, go build it in suburbia (or as in-fill at worst)!  If it's historic and
not endangered, better to leave it the F___ alone than to try to make it
"clean" and totally obliterate the signs of how it got from its origin to
the present.  I personally don't care if its an "A", a "C", or a "P"; the
damage and loss are all the same.  That said, I'm not against maintenance
and care, I'm just against trying to make something with a history to share
look too sanitary.  Buildings develop patina just like furniture, and that
needs to be maintained without destroying it.

Tom Gray