Sustainable development faces substantial challenges, with the built environment emerging as a major contributor to resource consumption. Office retrofitting, commonly known as changing the office fit out, is a common process in corporate real estate and accentuates these challenges due to its linear model of extraction, production, consumption, and disposal of building materials. This model leads to considerable waste and greenhouse gas emissions. This research examines the inefficiencies of the current linear model and explores transitioning to a circular office fit-out, which aims to minimise resource use and waste. The study focuses on the tenant-landlord relationship in corporate real estate, as these stakeholders are crucial for enabling circular fit-outs. The research question addressed is: “How can the tenant-landlord relationship facilitate the process from a traditional to a circular fit-out in office buildings?” Mixed methods, including literature review, case study documentation, and interviews, were used. What was found was that the relationship can enable circular practices if the stakeholders show positive behaviour, expertise, commitment, share information and communicate well, have a promoting business strategy around the fit-out product, and are pushed by society. Furthermore, the lease agreement showed to be crucial, and could enable circular practices even more than the actual fit-out design. Although these mentioned relationship determinants and arrangements are important, the research showed it is important to recognise the stakeholders individual responsibility towards circular practices. The research concludes with recommendations towards each stakeholder.