The article you link to is based on something I wrote. Why link to second hand news when you can get it first hand at this site? Please, people (not just you Shakeel, as many do it), when it comes to Spanish property news, check my blog (Property Buff – see above) for original content before you start sending our visitors to other sites.
By the way, this article is not about demolitions in Barcelona. The condemned properties are in the Alt Empordà, about 150 kms north of Barcelona.