That stand was built just before WW2 and was an add on of the old East Stand. It was left standing when the East Stand was demolished in the late 70s but quickly came down once the “ new east stand” was completedWasn’t it a supplementary exec stand?
The whole area then was a mess. The approach from the Fulham Road was just an expanse of scrubland, iirc.
That stand was in “ the away end” the shed being the opposite end not sure but pretty sure it was condemned way befor3 it was demolished
Like a lot of clubs little money was spent on grounds in the 50+60s and the east Stand which is still in situ nearly dragged the club under.
My first ever at Stamford Bridge was in the away end ( a school trip organised by a teacher who was an Arsenal supporter) we stood under that stand as it was raining.