What is Real Heritage???

http://www.thefotofanatic.com/Photography/Forums/Your-Bris
bane-Past/i-JP7VGmG/0/O/Bellevue%20Hotel%201903_141770.jpg

When looking at the site at 42 Elizabeth Street, I came to question Brisbane's approach to heritage and conservation.
We've had many very unique and beautiful buildings demolished (Bellevue Hotel) in the name of progress that in all fairness where great examples of heritage; whereas on this site, there is an older facade, and one from the 70's both is tremendous dis-repair and both have been hacked up and edited in their time so I don't understand how this is something that should be kept in order to keep "Historic significant buildings" in Brisbane.

It does not make sense.  Why would keeping 2/3rd's of a facade be at all a good indication of a historic building.  Whereas if they were to keep the whole building or at the very least the whole facade; I would understand but to say that you can keep some of it but not all and ignore using the facade in your building for anything but a bit of wall candy seems quite obsolete.