Nice. The thread and that facade approach reminded me of what Wiki quickly says about the design of place Vendôme (40) that's been developed from the 1680s. I couldn't tell how accurate Wiki is though...
Originally Posted by Wikipedia
[...] Les façades sont construites (avant même les bâtiments) [...]
Literally, the facades were built prior to the buildings themselves
By the way, Wiki also says that the square as we know it is actually a 2nd version developed from 1699. The facades of the 1st design would have been demolished to reduce the square area.
Maybe the buildings around place des Victoires (34), that's been developed in the same period, were built in that same fashion facades first, then come the rest
. At least, both squares show the typical symmetry of that time classic stuff.
The facadism concept you mention looks great... Wondering if it couldn't allow to develop some taller contemporary stuctures within the historic core by preserving its stone facades at the same time.
Heck, I'll visit those particular spots you're talking about, 97 looks excellent.