There's nothing "contemporary" about the Montparnasse tower. It was completed in 1973, which is called late modernism, but certainly not contemporary.
It's so old that it's about to get some new makeup already, but the problem is not the tower itself, it's the mediocre modern bars that were built around in the 14th arrondissement, probably the most forgotten arrondissement of the inner city currently. I think the 19th for sure, and even the 20th are getting more attention.
I don't care what the Brits say anyway. They've always been cynical and unfaithful to us. They're building tons of wealthier contemporary architecture over their cities, and they think (or hope) we'd be too royalist or retarded to do the same?
In their wet dreams only. We're going to push the right thing forward.