It was built in the 1950s out adjacent to a neighbourhood of the city called Little Canada, which was built to show us the wondrous, superior ways Canadians live. It's a typical, Post-WWII suburban neighbourhood. But it was a big deal at the time. Wealthy families left three-floor downtown rowhouses with bay windows for the prestige of moving to a cookie-cutter bungalow with (THE SHOCK) a front lawn there.
For extra cheese, check out the street names:
Our old Parliament is downtown, but not in any of these pictures. We couldn't use it after we joined Canada because, hilariously, running a Canadian province requires more people than running a country of equivalent size. It simply wasn't big enough.

Wikipedia
Also, as you know, St. John's voted overwhelmingly against Confederation with Canada. The 48% against represents almost the entirety of the city's residents, with very few votes against anywhere else (all but a couple of the districts that voted against are within today's St. John's CMA, and the others are directly adjacent). The British actually had plans to bring their army over to quash any riots following the referendum. But people in St. John's protested by flying all of our various flags at half mast and draping all businesses/homes/etc. in black funeral tarps. All involved with Confederation treaded lightly near the city in those days.