This article explores the engineering of affect in socialist urban design and subsequent changes in the affective register of a rapidly growing city in late socialist Vietnam. The setting is the north central city of Vinh, destroyed by aerial bombing during the American War and rebuilt with assistance from East Germany. A primary focus of urban reconstruction was Quang Trung public housing that provided modern, European-style apartments and facilities for more than eight thousand residents left homeless from the war. Drawing from interviews, images, poems, and archival materials that document urban reconstruction, the article foregrounds the complex historical, ideological, social, and gendered meanings and sentiments attached to a particular construction material: bricks. It argues that bricks have figured prominently in radical and recurring urban transformations in Vinh, both in the creation and the destruction of urban spaces and architectural forms. As utopic objects of desire, bricks gave shape to an engaged politics of hope and belief in future betterment, as construction technologies once reserved for the elite were made available to the masses. In Quang Trung public housing, bricks harnessed political passions and utopian sentiments that over time, as Vinh's urban identity shifted from a model socialist city to a regional center of commercial trade and industry, came to signify unfulfilled promises of the socialist state and dystopic ruins that today stand in the way of capitalist redevelopment.