Two questions about this sentence:
 
(1)  If you were doing an old-fashioned Kellogg-Reed diagram of it,
where would the intensifier "itself" go?  As an appositive for
"building" or as a modifier of "building"?
 
(2)  And what is the subjective complement in the sentence -- "stories"
or "high"?  I think it is "high" wqith "stories" modifying "high" and
"four" modifying "stories."  Right?
 
Michael Kischner