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In this paper, we propose a step by step method based on publicly available data to design a master plan optimizing the number of coworking spaces to deploy in a given area, as well as their placements across the territory. We aim to develop a holistic systemic approach, in line with the strategic view of the territorial forces, with the objective of reducing the GHG emissions from commuting. The method that we propose is general and can be applied to any territory. As a first step, we collect and preprocess population data to convert them into an exploitable form. Then we design a decision model that describes when a person would choose to work in a shared office, and which transport mode they would use. We finally perform an optimization to maximize the gains in terms of traveled distance using a linear solver and heuristic methods, and comparing their respective effectiveness. The results are encouraging, since they show that using an optimized network computed with our method, we could reduce the total distance traveled by the people commuting by car by 23%, which represents a reduction in carbon emissions of hundreds of tons per day at the scale of the studied use case region around Toulouse., Arbeitsberichte Verkehrs- und Raumplanung, 1768