140 William Street, Modern office building in Melbourne, Australia

140 William Street, originally BHP House, is a 41-storey steel, concrete and glass tower built between 1969 and 1972 by Yuncken Freeman. Its main body is a flat-topped rectangular slab clad in dark glass panes set in a dense grid of thin vertical and horizontal mullions, with lighter greyish vertical bands on the left and right sides. A narrow lower glazed section sits at the base behind street trees.

The building was completed in 1972 by the architectural firm Yuncken Freeman at a time when Melbourne was expanding vertically to accommodate growing business needs. It represents a turning point when mid-rise and high-rise structures began reshaping the city's skyline.

The tower is known as BHP House because it was built for the Broken Hill Proprietary Company and ran on natural gas supplied by that company. Its name and identity are tied to the steel and energy industries that shaped Melbourne's corporate centre in the early 1970s.

The building is accessible directly from William Street, where bus stops and nearby train stations make reaching it straightforward by public transport. As an active office building, the lobby and entrance areas are most accessible during standard business hours.

The building is listed on the Victorian Heritage Register, a recognition that modern 1970s structures can be valued as important parts of urban history. This reflects a shift in how cities view contemporary buildings as worthy of preservation for future generations.