So the signage behind the former Comic Kingdom on 71 Liverpool St has been exposed.
There's an old 'Discount Books' sign, and only then do I notice the LOVELY old lettering of LIVERPOOL ST above it!
I haven't been able to find much about the building's life before Comic Kingdom on Trove/City of Sydney archives, except that it used to be in Sydney's Spanish Quarter and there were guitar lessons delivered there for all ages.