It seems there is a lot of razing/reconstruction going on around Tucson now. I suspect one of the reasons is
that?the owner of an old building can realize a greater profit by demo-ing and building to suit or leasing
the vacant land, rather than rehabbing the old building. This may be due to the cost of bringing older buildings
up to code. It may also be due to the cost of reproducing or maintaining the original architecture in today's
construction environment.
Unless a property is designated "historic", it's probably to the owner's advantage to just start over.
I've been in Tucson long enough to remember the El Conquistador hotel before it was demolished to make El Con Mall that has been demolished to create what is there today.