Torre Lugano is a 420-foot-tall example of the gap between Spain’s recent dreams of economic glory and its grim new reality. Some 1.5 million unfinished, unsold or unwanted residential units stand scattered across the country, products of a still-deflating housing bubble that threatens to undermine Spain’s broader economy for years to come. It is the hangover after an epic fiesta, a period Spaniards now refer to as “cuando pensábamos que éramos ricos"—"when we thought we were rich.”