140 William Street, Perth

140 William Street, Perth
140 William Street as seen from Central Park
Alternative names	One40william Commercial Tower
General information
Status	Completed
Type	Office/retail
Address	140 William Street
Town or city	Perth
Country	Australia
Coordinates	31°57′7″S 115°51′29″E / 31.95194°S 115.85806°E / -31.95194; 115.85806
Current tenants	Government of Western Australia
Construction started	2007
Completed	2010
Cost	A$216M
Height	92 metres (302 ft)
Design and construction
Architecture firm	Hassell
Website
http://www.one40william.com.au

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

It includes the 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.^[1][2] It currently houses the government departments of Planning, Lands and Heritage, Transport and Mines, Industry Regulation and Safety, and various other offices.^{[citation needed]}