This paper explicates development efforts in Tohoku University that are necessary for high capability architect education using versatile simulation tools. In this paper, we first explain the social change toward architectural design in the “Era of Digitalization” and needs transformation for Architects today especially in Tohoku region after having the experiences of March 11th 2011 disaster. We then introduce a study environment and curriculum for Design education from undergraduate to master level program in Tohoku University. Thus, an effort will be exemplified taking a case study of each student’s design project of an adequate improvement process using CASBEE index and simulation tools that can facilitate effective communication and interaction between junior architect (Design Laboratory students) and junior engineer (Sustainable Engineering Laboratory students). The relevancy of so-called Retro-fitting Improvement Approach will be exemplified based on different building types and various simulation index of each student’s design projects. Such developments are expected to achieve new levels of architect education standard and connectivity between designers and the engineers for wide range of sustainable design project. The outcome will serve as a solid basis for the primary design training to larger urban scale of high performance Smart City design project in the future.