In 1967, Habitat residential complex gained worldwide admiration and turned to be one of the major symbols of Expo 67 as it was an outstanding integration of architecture and structures. Fifty years later, Habitat 67 still seems a spectacular residential project. However, it may not be a state-of-the-art housing project according to the current design considerations. In 1967, architects and engineers were exploring materials, and industrializing building constructions. Also, further prefabrication technologies were being established to confront the design barriers and to reduce the construction duration and costs. It’s almost a decade that designers have been more concerned about the sustainable development of human-built environment and reduction of building construction impact on global warming, Co2 emission, Ozone depletion, acidification of soil and ocean, and consumption of natural resources. Therefore, if such an innovative project as Habitat 67 were to be built today, the design approach would be different. 

This research studies comparable design alternatives for such a residential complex in Montreal, considering its environmental performance and impact. The main idea of this study is to compare the prefabricated reinforced concrete construction of Habitat 67 with a similar residential design where Cross-Laminated Timber (CLT) panels are utilized instead. The reason for choosing CLT is to keep the weight parameter consistent and to compare two heavy constructions that have two different carbon footprints.  This research is based on a GA-TRIZ hybrid method.