The original guards were a continuation of the slab, not a precast panel. They had to be chiseled off and the slabs were reformed. My point was mostly that if they were renovating the balconies to modern standards, it would have been nice to see glass guards vs the folded metal panel railings currently in place. Yes the original formed concrete balconies had character but realistically restoring them or reforming them was never on the table.
If it was possible in the 1970s, why not now? Why condone gutting this heritage building of its most notable features? The metal panel railings have a chance of resembling the original design. Glass railings would look generic and wouldn't capture the spirit of the original design.