The development of corporate buildings and the structure of workplaces changed dramatically during the last number of decades. Studies show that the utilization of e.g. office space lies at 5% over its lifecycle – so we need to rethink the design & the management of corporate facilities. In fact buildings which are heated, cooled and maintained but remain largely unused over time are economically & ecologically inefficient! Our built environment is identified as a crucial area for the realisation of the EU climate goals but the potential to reduce energy-demand and CO2-Emissions remain widely unused. Beside the opportunity to save a lot of (real estate and company/organisational) money through an optimized FM - the mentioned arguments above illustrate, that the improvement of space-utilization is also part of Corporate Social Responsibility. More-Space analyses saving potentials of e.g. flexible workplace management. Know-How from real estate development, facility management and mathematical modelling and simulation are brought together to improve and optimize space-utilisation. On going studies show impressive saving potentials up to 50% of the current workplaces and an optimised utilisation up to 80% within companies. Other studies within school buildings showed that up to 40% of the classrooms could be used for other purposes through improved space-management. These evaluations add up to massive saving potentials of user costs of buildings and tons of CO2-Emissions per year. The More-Space Tool is able to demonstrate each company its maximum benefit, as the model is customizable and supports rapid prototyping – a relevant characteristic for decision makers as managing directors, facility managers and others. The More-Space approach underlines that a successful achievement of the FM-potentials needs interaction between at least four competences: 1.Organisational development – necessary changes of processes and organizational structures; 2.Space Management - potentials e.g. within intelligent distribution of fixed-term rights of utilization but also within spontaneous occupancy; 3.Real Estate Planning/Development – Developers and designers must be able to create built infrastructures, which support dynamic usage of buildings and 4.Simulation – the high potentials for more efficient utilization often remain undetected until dynamic event-based computer-simulations facilitate, as the complexity of dynamic viewing of utilisation is extremely high.