In addition to grand public buildings, they also designed apartment buildings in the new, planned section of the city called L'Eixample (the enlargement).
Three of these buildings stand in the Manzana de la Discordia. This translates as both Block of Discord and Apple of Discord, (They kept the Castilian word for 'block' to retain the pun.) and refers to the wildly differing styles of the modernista apartments. The one on the corner is Casa Lleo Morera, by Domenech i Montaner. Two doors down is Casa by Puig i Cadafalch. And right next to that is Casa Batllo by Gaudi.

Gaudi
The porter's house for the Guell estate.
Count Eusepi Guell was a major patron of Gaudi.

Domenech i Montaner