This city was born as a project devised by the Belgian Fernando Robette and Agustín Poli, who came to Argentina in 1908 planing to stablish a similar city to their native Ostende in Belgium. They bought the dunes zone to Manuel Guerrero with an urbanization project designed by the French architecs Chapeaurouge y Auguste Hughier and the engineers Weber y Gilardón. This project included avenues, stravenues, areas for public buildings, a train station, a cemetery, a municipal piece of land to keep a light truck or animals, and a main street that reached 50 metres in length.

In 1912, the “Rambla Sur” construction begins. In 1913, a hotel is built by the “Hotel Termas Ostende” company, takes the name of the building company and opens on 13th december that same year. This building is today the Old Ostende Hotel, with nearly eighty rooms. They also build a church given by Domingo Repetto, which is buried under the sand in the 20´s.

During these years, the Belgian return to Europe –perhaps because of the war- and never come back. After several unsuccessful forestation attempts, the sand covers many of the constructions of the first project, among them the esplanade unearthed in 1990. This showed the failure of the dunes fixation project.

In 1943, the city of Pinamar is opened and a year later, Arquitect Bunge´s urbanization project is passed by Buenos Aires Province Executive. Wih Bunges success to finally manage to forest the dunes, Ostende´s project stayed in the past. On 23rd May 1983, the Partido de Pinamar is created, adding to its jurisdiction Mar the Ostende among other towns.