Twenty-one years after winning the Turner Prize, the artist-turned-museum-founder Damien Hirst has scooped Britain’s top architecture award for his Newport Street Gallery. (What's the arts equivalent of an EGOT?) The south London former painting workshops elegantly converted and expanded by Caruso St John architects (Gagosian’s go-to Brits) carried off the prestigious Riba Sterling Prize last night. The only blot on the horizon is a proposed luxury skyscraper at the end of the street, which locals have dubbed “an alien phallus”. Gentrification gone too far?