The Reading-based office is famous for its Sir Norman Foster designed large wind turbine, which partially powers the site and is easily visible from the busy M4.
Property specialists M&N will manage local national and trade media relations for the development.
Cisco Systems, Symantec Software and Logica CMG already hold offices at the site.
Separately, water sculptor William Pye has employed M&N to promote his ‘unique and inspiring’ works. Pye famously created water sculptures for The Prince of Wales’ residency, Highgrove.