Hunter Mason played a key role in transforming 77 Castlereagh Street under a Construction Management contract with MostynCopper. The team delivered speculative suites, lift lobbies, and bathrooms across Levels 8–10 as part of Abacus Group’s multi-year strategy to elevate the building from B Grade to A Grade. Despite inheriting limited design documentation and a compressed timeline, Hunter Mason’s collaboration with Gray Puksand and Aston Consulting ensured high-quality outcomes in a live environment.