Green Spine, Dual skyscraper development in Southbank, Melbourne, Australia

Green Spine is an unbuilt dual-tower design by UNStudio and Cox Architecture for 60 Southbank Boulevard, Southbank, Melbourne. Tower 1 was planned at 102 storeys and 366 metres, Tower 2 at 59 storeys and 251 metres. The design pairs pale beige facades with dense grids of small rectangular openings and curving outer faces covered in rows of planting, with pocket parks and a publicly accessible botanic garden in the taller tower.

Beulah International bought the BMW flagship showroom site at 102–156 City Road in December 2017 for $101 million, then added 158 City Road, home of the seven-storey Hanover House, in April 2021. UNStudio and Cox Architecture won the 2018 design competition. Planning approval came in April 2020, but the project was shelved in April 2026 for lack of financing and the site was to be sold.

The name STH BNK by Beulah came from the developer's 2018 design competition, which drew six bids pairing international firms with local ones; UNStudio and Cox Architecture won. The site at 60 Southbank Boulevard was assembled from a former BMW flagship showroom and Hanover House, a seven-storey block that was Southbank's tallest from 1973 to 1990.

The site is an island block bounded by Power Street, City Road, Southbank Boulevard and Waterfall Lane in Southbank, opposite Australia 108 at 70 Southbank Boulevard. It is occupied by the former BMW showroom and Hanover House, a seven-storey building that was Southbank's tallest from 1973 to 1990. No towers were built, so there is nothing to visit; the land was to be sold in 2026.

The project was never built: in February 2025 Beulah placed the development manager BSSPV Pty Ltd into administration, and in April 2026 the scheme was shelved for lack of financing. The site, an island with four frontages, was to be sold later in 2026.