This historic building is currently the headquarters of the Government of Aragon. You can visit various theater performances and concerts here.
Wikipedia (Spanish) https://es.wikipedia.org/wiki/Real_Casa_de_la_Misericordia_(Zaragoza)
Address Paseo María Agustín 36, 50003 Zaragoza, Spain
Coordinates 41°39'11.3" N -0°53'27.42" E