I'm finding all this about spandrel panels very confusing, and I know very little about this sort of construction... but count me in the group that thinks the glass is frosted.
I understand that a spandrel panel will cover an interior wall, or partial interior wall, and basically not be exposed in any interior living space. It will be covered on the inside with drywall, or a cement wall, or interior panel of some sort. It makes sense that whatever low-E or special insulation or tinting that might be on a window that is part of a living area would be omitted from a spandrel glass panel -- probably for cost savings. Or the insulation properties would be achieved in a different way, such as frosting or opaque glass.
I looked it up, it seems pretty clear (pardon the pun) that the glass used would be different -
http://www.viracon.com/page/spandrel
The panels on the corner balconies do seem odd, as they definitely block what would be a nice view from the balcony. But I think they are covering structural cement walls. Notice how on the most recent photos, you can still see a few of the interior panels which don't have their drywall behind them, yet the ones on the edge are all covered up on the interior?
I looked at some older photos prior to the glass-in of the bottom section, and does appear that the corner balconies are walled-in on the sides with what looks like a cement wall (look at the first floor with glass)...