This chapter presents two case studies, the refurbishment of two existing office buildings located in London (UK). The client is The Crown Estate, and the design team is led by Orms Architects, (Orms). The first case study is 10 Spring Gardens, a building located in the St James’s area of Central London. The second case study is 20 Air Street, a building that sits exactly on the footprint of the former Regents Palace Hotel, in London. The relationship developed between both stakeholders, the client and the architects, shows the importance of stakeholders to collaborate, share sustainable values, and develop a circular economy approach to achieve a commercially viable project.