The scheme, which is led by Endurance Land in partnership with Henderson Park, will see the building revamped with extensions to create new 8th and 9th floors.

This will increase the lettable space at 66 Shoe Lane by around 10%.

Half of the 150,000 square ft building has already been part pre-let by its previous tenant Deloitte.

Designed by London architect, Stiff+Trevillion, the refurbished building’s environmental performance will be enhanced to a BREEAM Excellent rating, with extensive internal remodelling and redesigned façade.

External balconies will be installed on all floors, providing terrace space overlooking the central, landscaped courtyard.

Steven McGee, managing director of ISG’s Construction South business, said: “The opportunity to work in partnership with Endurance Land at an early stage and under a collaborative form of procurement has proved instrumental in our ability to innovate and reduce programme duration.

“Bringing our supply chain partners into the process at the earliest stages has given the wider team the opportunity to explore optimum solutions for key construction challenges with significant benefits to cost, programme and value-added measurements.

“This enlightened approach is highly desirable for complex projects, and more widely, it represents a high-performing template for all project procurement.”