Work is set to start on site in January to transform the former Arbuthnot Bank and complete in summer 2027.

Conamar will create 36,000 sq ft of best-in-class, sustainably refurbished workspace including a substantial rooftop terrace.

A central part of the project will be a new façade, featuring curved glazing, high-performance stone and terracotta cladding, which will revitalise the building’s presence on Wilson Street.

Conamar is understood to have fought-off competition from RED Construction and Forcia to land the job.

David Hughes, Director, Alchemy Asset Management, said: “We are delighted to have selected Conamar to deliver this exciting project on behalf of our overseas client. This speculative investment responds directly to sustained occupier appetite and reflects our confidence in the resilience of the London office market.

“Having secured planning consent earlier this year we ran a competitive tender process over the summer, and we were impressed with Conamar’s diligence and commitment to the project. We look forward to delivering this refurbishment with them into an increasingly tightly supplied market.”

Nathanial Crichton, Pre-Construction Director at Conamar, added: “The competitive tender, followed by a rigorous due diligence period, enabled us to demonstrate our understanding of the client’s development drivers and value priorities.

“Through collaborative design and commercial analysis, we identified additional net internal area and realised close to £2m in cost efficiencies. Our dedicated design partners and core supply chain have been instrumental in shaping a deliverable and efficient route to market. We are very pleased to be moving forward and look forward to bringing this project to life.”