Social media group Reevoo is moving to a 9,000sq ft office in Southwark.
The cloud-based social commerce solution provider has taken a 10-year lease on the space at Friars Bridge Court, in Blackfriars Road, website CoStar reported.
It said the building had also secured Campbell Reith Hill and animal charity The Brooke as tenants.
Reevoo is currently based a few hundred metres away in Webber Street.
"We've already surpassed one degree of global warming," said Kristen Buida, manager of the London Climate Change Partnership.