We're all crying over the 1960's looking spandrel glass as always these days.
Latest accurate pictures by ZeusUpsistos.
The way it looks totally depends on light and angle.
This is a globalized building anyway.
The developer and owner of the building must be Generali, a large Italian corporation mostly specialized in insurance contracts, hugely globalized.
The glass manufacturer and tenant is Saint-Gobain indeed, a French material manufacturer widely globalized as well.
The facade designer itself would be from Turkey, but I assume the use of old-fashioned spandrel glass is not their fault at all. They certainly would do better if they were allowed to.
But the environmental regulations are very local and super annoyingly French.
My guess is for now, spandrel glass is the only convenient way to meet their environmental and energy-efficiency requirements over la Défense, which is not a 5-star district yet. That's it.
In the central business district of the 8th arrondissement, they'd probably have built a trillionaire crystal palace.
We'll have to be patient to get some luxury stuff in la Défense. I think Hermitage will sound the trumpet.