How many buildings were destroyed?
2 milion houses were destroyed in the Blitz. (60% of these were in London alone)
many building were destroyed in Dublin City Centre including : Most of the buildings on Lower Sackville Street (now Lwr. O'Connell St.). Some buildings on the eastern side of Upper Sackville St. Many buildings at the eastern end of Henry St. and Princes St., the western end of North Earl St. and Lwr. Abbey St. Also buildings on Middle Abbey St, and Eden quay. Many other buildings were damaged.
Hiroshima was destroyed in 80% of the buildings. They measured that by the buildings still standing. That they didn't take in consideration was the number of the still standing buildings that served no purpose. Still standing doesn't mean you can use it. As a matter of fact, most of the still standing buildings were destroyed for being not safe for living or housing a manufacturing plant.