Architect Carlos Garmendia, left, and homeowner Tas Careaga relax in the living room of Tas’s ecclesiastical pad. For three years, the two collaborated closely to transform a 16th-century Basque church near Bilbao into a 21st-century home. With its soaring vaulted ceilings, blend of historical architecture and contemporary aesthetics, and eclectic furnishings, Iglesia de Tas inspires awe once again.