i work at pretty well known property consultant in madrid and we recently did a study of barcelona pricing. we analysed only newly built properties so our prices are a bit higher. plus, we looked at pricing per usable meter, which is how they are generally listed in Barcelona (i am assuming these are “constructed” meters since they don’t otherwise state). And since these numbers are from idealista, I’m assuming they include new and resale properties since that is how they generally list pricing.
This site has more recent info from the Sociedad de Tasacion under market info.
If you tell me if you’re looking at new or second hand and what area i can give you our numbers.