Constitution Square, official building.
All the buildings built between Unirii Square and the Parliament Palace were erected during the '80s. They replaced old neighborhoods, which were much more valuable in terms of cultural, historical or architectural value.
I never got to see the old houses though. They were already destroyed, mostly, when, as a child, I passed by almost daily, for months, in the late '80s, when I spent my vacations in Bucharest, and the place still felt like a construction site.