When Cecilia Tham and Yoel Karaso of Habitan Architects bought their first-floor apartment in an 1894 block of the Fort Pienc neighborhood of Barcelona in 2005, they knew they were taking a risk. Casa Alí Bei was a bargain because it is afectado (“affected”)—–that is, the land is zoned for redevelopment. A baby (Hanna) on the way, the possibility of being evicted, and a tight budget necessitated a canny renovation strategy, yet one that still honored the dazzling turn-of-the-century tile work and ornate moldings. A stone’s throw from Jean Nouvel’s Torre Agbar, the apartment, like the neighborhood, has been reborn as a patchwork of old and new. Tham tells us the story.