Buildings remain empty or are underutilized due to the reforms and structural changes of welfare areas all over Finland. Vacant or underutilised buildings cause costs and safety risks, and their condition deteriorates faster. At the same time, the construction of new buildings consumes more natural resources and energy. The RAKEL project responds to the need to find new uses for vacant buildings in cooperation with regional actors, such as municipalities and companies. In particular, the public sector has opportunities to plan and implement the reuse of real estate. The goal of the project is to enable the start-up of new functions in vacant but still usable buildings. The goal is to jointly develop new ways to utilise buildings and increase their utilisation rate by making business or shared use more efficient. The project utilises digital modelling of buildings and construction engineering surveys to take the characteristics of buildings into account when planning new functions. In the background of business development, circular economy business models are utilised and the utilisation of the sharing economy, providing services, as well as digital solutions as part of reuse planning is especially strengthened. During the project, construction technology demonstrations will be carried out in buildings and premises selected as demonstration targets. In addition to these, the innovations that emerged in the joint development work on new operating possibilities and business activities are being piloted. The pilots aim to strengthen regional vitality and offer various applicable examples for different parts of Finland. The project actions are divided into five work packages: TP1 Project management TP2 Construction surveys TP3 Co-development TP4 Business and joint use TP5 Communication and interaction The project tests how digital solutions support the extension of the life cycle of properties in both a technical and functional sense, as well as produces technical information about real estate sites to be used in planning the extension of the life cycle and innovating new ways of use. In addition, we will find out how the various working methods and tools of joint development are suitable for the ideation and development of new activities in buildings. Based on these, replicable business and shared use models related to buildings and premises are mapped and developed. In terms of the possibilities of extending the life cycle of buildings, the focus of the project is also strengthening the awareness of the target groups and versatile communication about the measures and results of the project. The goal is to produce material that remains after the end of the project for the target groups to use and to support the planning and implementation of the activities. The project supports the national goal of the green transition by carrying out tangible case studies and development cooperation in different regions in Finland. The case examples support building paths towards new uses and are applicable in many ways to regions and municipalities planning similar development work. As a result, the life cycle of the buildings will be extended, and the adoption of the operating model will be strengthened in the cooperating municipalities.