The world is getting urbanized and we need more and more resources to build and develop our cities. With this growth comes an increased pressure on natural resources. At the same time we have already have an impressive ''bank of materials'' available in the cities, namely in our buildings. By mapping and understanding the amount, quality and accessibility of these materials we can better plan for the future. We can decrease the pressure on new materials and create a circular building industry. AGAIN X provides a top down approach to mapping existing buildings, their content and status, by using aggregated data and machine learning. Our SaaS platform will give better KPIs(Key Performance Indicators) to real estate investors and managers. The KPIs will help them make more sustainable long-term decisions; better for their wallet and better for the planet.