Young adults are changing the architecture of “third places,” like coffee shops, bars, and restaurants. Millennials, as they are typically called, have steadily moved to cities as they have become increasingly disillusioned with suburban lifestyle that has been a cultural norm since the 1950s. This has created a new wave of urbanization and gentrification. Gentrification, first coined by Ruth Glass in 1964, is the phenomenon of affluent people, primarily white people, moving into and displacing long-term residents or urban neighborhoods. Sociologists, economists, and urban planners have studied gentrification since the inception of the term, but usually through the lens of housing conditions and real estate values. However, the current wave of gentrification is associated with wider trends of lifestyle than housing or location. These new trends of lifestyle gentrification permeate into aesthetics, designs, and architecture. This thesis will explore the architecture of “third places,” the extensions of the personal residence, as a vital part of the current lifestyle gentrification occurring in American cities. This thesis will look at the evolution of “third places,” the shifting values of food and drink culture, and the people that define them. Methods will include studying changes in food and drink culture through previous sociology work as well as looking to projects in Seattle as case studies for how design has changed.