You say that as if it can't be rebuilt.
I say it as someone who recognizes that it 1) would cost money to restore 2) would be a loss to operate 3) would decrease the RSF the current building owner purchased.
It was an informal agreement from the start, and the city didn't bother get it in writing. Does that blow? Sure, but it's a slippery slope, expecting current ownership to atone for the (perceived) sin of the past owners.
Finally, I think most of us have been around long enough look past City Hall's blustering and realize that if anyone down there really cared about this, an observation deck would have already been rebuilt and opened to the public.
Ron, perhaps you should start a letter-writing campaign to the Mayor so he'll wrap it into his re-election bid.