This amazing building, the Casa Amatller by Puig i Cadafalch, a contemporary of Gaudí, which combines the neo-Gothic style with a ridged façade inspired by houses in the Netherlands, is part of the block known as the "mansana de la discòrdia" of Barcelona.
http://www.barcelonaturisme.com/wv3/en/page/1197/casa-amatller.html