Brutalist architecture
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Brutalism was a style of architecture.
During their time at the Collective, the Third Doctor mentioned that the buildings in Sarah Jane Smith's time were brutalist. (AUDIO: The Gulf [+]Loading...["The Gulf (audio story)"])
Upon watching Mancopolis return to its natural appearance without digital cladding, the Fifteenth Doctor described the change as "goodbye Mega-City One, hello Brutalist revival". (COMIC: "Supernova in the Sky" [+]Part of Mancopolis, Loading...{"namedpart":"Supernova in the Sky","1":"Mancopolis (comic story)"})