In the Mastermind Crash course, buildings are analyzed on various aspects, in particular looking at the impact and (measurable) results that the interventions in the building have had. Much of the built heritage is vacant, requires a re-use or the current use requires an update. This causes buildings to change. At Heritage & Architecture we want to make students aware of the impact these changes have on various aspects that play a role in this. This chapter is about architecture. Architecture is a broad concept. That is why we have focused on a limited number of aspects: space, connections and details. So, three scale levels are included in the analysis. A value assessment can be made on the basis of various methods. This is explained and illustrated in this chapter with a lot of examples. This judgment is placed in the framework of the Mastermind Crash course, after which an evaluation and comparison can be made of the change of the building at the moment and with respect to the building in a previous phase of life with the focus on Architecture. The idea behind the three dimensions of analysis, is that you look at a building not just as an object, but essentially as a living element that relates to the surrounding space, that has its own details proving its uniqueness and that all these three dimensions are influenced by the purpose for the use or the redesign of the building. The building’s AR-DNA is an important factor to take into account to try to understand the building itself. The before and after situation always depends on the character of the original building. The total overview of insights provided by this exercise results in a collection of practical examples that serve as learning material for architects in training. Architecture is an essential part of the assessments addressed by the Mastermind Crash course and, by studying examples and appreciating them, it will contribute to a design vocabulary for the redesign of existing buildings with respect to their heritage values.