AdvertisementNationalWAProperty development ‘You can’t undo it’: Neighbours lose fight against $10m William Street proposal Indigo Lemay-Conway July 30, 2026 — 3:14pm Save You have reached your maximum number of saved items. Share A A AThe first development on William Street under new City of Vincent guidelines has been approved by state planning officials. An artist impression of the 441 William Street eight-storey development. AdvertisementThe development application is the first to be submitted under the city’s new William Street Planning Framework. The $10 million proposal is set to be built at 441 William Street in Perth on a currently vacant block of land that abuts the Perth Mosque.