In my graduation studio, “Constructing the commons” in the context of Valparaiso, Chile, South America is the topic under the theme “Position in Practice”, in the track of Method and Analysis. Since September last year, throughout the nine months of graduation studio, I have observed, analyzed, researched, reorganized, and envisaged some aspects in the urban to explore what exactly is the real commons in the city. I am concerned about What are the commons in contemporary and local contexts, what are the commons in the architectural vocabulary, and what are the interventions that we achieve commons by, in practice? My answers to those questions includes the observation and experience in Valparaiso, the research of the common resources, the position regards to co-existence, the choice of the site, and the generation of program, function, atmosphere, as well as the ultimate building.