The period between wars in Italy associated to the Fascism era in Italy, where Rationalism Architecture was born. Terragni's Casa del Fascio which designed and build in this period is a contradictory building which raises a lot of questions regarding the meaning and purpose of an architect and the building itself. Casa del Fascio has different interpretations, readings, texts, and written facts about it. It is the least propagandistic casa of all build ones looking through the building, its function and importantly in a period when it was build. That was the reason that it makes this building so important, and not only in architectural point of view. It can be argued that Terragni was trying to evolve his architecture less propagandistic way by analyzing Casa del Fascio. Although the Terragni described as rationalist architect, rationalists were Fascists indeed, but if we look to another perspective, if they were not in the party, is there any possibility of getting success in the architectural field of that era? However, Modernism without regime could not exist in Italy, at least it did. In this paper, we propose to identify and then examine three main characteristics of that time-period that can make possible to have an understanding about Terragni's Casa del Fascio.  The paper will briefly render out the historical context of Italian Rationalism, mostly concerning important points and stress the role of context in Italian Rationalist Architecture.  The period of architecture under the regime of fascism would be discussed with the analogy of the journal Quadrante. In fact, the architectural difficulties and complexities in the Fascism period in Italy was a precise measurement of the time for intellectuals working in this period.  Terragni's Casa del Fascio will be the analogue of the discussion. It will not be an attempt to restore the Rationalist architects experience as antifascist, however, the analysis of Casa del Fascio bring us to another perspective. Can someone talk about the most important building of Rationalism in Italy, but not mention Fascism? How propaganda played a role of the building's composition? Is it a building of Fascism or just an office building? What is the view about Terragni as an architect, is he a genius modernistic architect or just a servant of the regime? These questions are the main concern while analyzing the Rationalist period in Italy and Casa del Fascio in Como, and the answers are not simple, rather they are complex. Keywords: Rationalism in Architecture, Giuseppe Terragni, Fascism, Casa del Fascio

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