Thanks for posting.
Do you also have a shot that is exposed more to the right, say, enough to blow the highlights so they can just be recovered nicely? That way you can keep the shadow more "as is"
Intention was not to blow highlights - so that content in the illuminated windows and showcases is not lost and could be normally seen on normal size print. Lost are are only things that could be sacrificed- sources of lights itself - very small areas on the image . ETR rule is not applicabale for such kind of shots unless this is only for postcard size prints
Also could add that 1Dx does a very good job in preserving highlights in evaluative metering mode - almost nothing is lost - only sources of lights itself. Still need to see behaviour when highlight protection mode is turned on - but usually that shifts histogram slightly to the left making image even more underexposed - at least on previous bodies
Actually highlights were recovered on this image to be just on the right side of histogram - before they were out.
Whites were moved to (-100) ,
highlights were set to (-50)
and exposure was moved to EV +1.5
and shadows were set to (+40)