Engineering company Ramboll UK has taken 2,900sq m of space at 240 Blackfriars Road on the South Bank.
The firm will move in to the first three floors at the 22,000sq m development, which is a joint venture between Great Portland Estates and Great Ropemaker Properties – the property arm of the BP Pension Fund.
Ramboll joins UBM and law firm Boodle Hatfield at the site, where building work was completed six weeks ago. A 15-year lease has been signed.
Neil Thompson, portfolio director of Great Portland Estates, said: "The early letting success at 240 Blackfriars Road is a positive endorsement of the quality of the building and we have strong interest in the remaining space."
"We've already surpassed one degree of global warming," said Kristen Buida, manager of the London Climate Change Partnership.