140 William Street, Perth

140 William Street, Perth
140 William Street as seen from Central Park
Alternative namesOne40william Commercial Tower
General information
StatusCompleted
TypeOffice/retail
Address140 William Street
Town or cityPerth
CountryAustralia
Coordinates31°57′7″S 115°51′29″E / 31.95194°S 115.85806°E / -31.95194; 115.85806
Current tenantsGovernment of Western Australia
Construction started2007
Completed2010
Cost$216 million
Height92 metres (302 ft)
Design and construction
Architecture firmHassell
Website
www.one40william.com.au

140 William Street, Perth (styled as one40william) is a commercial development in Perth, Western Australia.

It includes Gordon Stephenson House, named in honour of Gordon Stephenson, an architect responsible for planning much of modern Perth's urban form through the 1955 Plan for the Metropolitan Region, Perth and Fremantle. It currently houses the government departments of Planning, Lands & Heritage, Transport and Mines, Industry Regulation & Safety, and various other offices.