Absolutely. en.wikipedia.org/wiki/Brutalist_architecture Uncommon for small residential projects, even then. Now, I feel like it’s more common to build poured-concrete floors supported by columns, which gives them a lot more flexibility in what the facade looks like - more glass & natural light, shiny metal patterns, fancy colors. There’s a couple buildings I remember thinking, “Wow, they put a really realistic wood grain pattern in that concrete - is that supposed to fool us into thinking it is wood?” before I realized it’s just that they were too lazy to cover up the molding texture.