Th 27,900m² scheme includes a cleaned and refurbished façade, new floor-to-ceiling windows throughout, a level 30 rooftop extension with roof garden and a new two-storey building in Bressend

Thirty High exemplifies retrofit, sustainability and climate resilience through the deep retrofit of a 1959-1963 office tower. Retaining existing structure, core and facades, this pioneering project achieves <65 kWh/m2 energy intensity—approaching new-build performance—while delivering 60% embodied carbon reduction versus GLA benchmarks. Targeting WELL Core Platinum, BREEAM Outstanding and NABERS 5*, the fully-electric building demonstrates best practice in sustainable transformation. Circular economy principles and innovative delivery methods challenge perceptions of reused buildings, proving retrofitted offices can compete with new-builds in quality and performance.