Station Park | 18, 28, 36, 40, 50 fl | U/C

[ijmorlan]

The wall (I am assuming) is to protect passer-by's from the dangers of the work site.  If a flying piece of debris flew thru a viewing hole, there would be a liability.  (I also remember them, and miss them too... I'm just trying to think like a lawyer for this post)

Coke

I recall the holes having metal mesh across them, similar to chain link fence. I don’t see debris flying through as a significant or even measurable threat.