Work has started to demolish the old Amex HQ, nicknamed the Wedding Cake.
The nine-storey building, commissioned by American Express in 1977 to house its European headquarters, has to come down this year as its demolition was a condition of planning permission for the new John Street HQ being built.
Internal demolition has already begun, and the external building will be taken down in stages over the summer.
A spokeswoman for American Express said: “To meet timeframes required by the s106 agreement, American Express can confirm it has entered into a contract for the site clearance and subsequent demolition of Amex House.
“Work on the interior has commenced. Exterior works are expected to commence early summer this year.”
Mark Bishop, commercial manager at Syd Bishop & Sons (Demolition), which is undertaking the work, said: “We will be using a high reach demolition excavator to progressively demolish the building from the top down.
“This is the most efficient method of demolition for this type of building and will be a gradual process. As such, the demolition impact on local residents and businesses will be kept to a minimum.”