The building, a voluminous complex resulting from several extensions, is made of pink granite from the quarries of La Clarté, Perros-Guirec district.

The manor was built on an islet bought at the end of the summer of 1892 by Bruno Abakanowicz (also called Bruno Abdank, who a little later - around 1896 - built the Bellevue hotel in Ploumanac'h), engineer and mathematician of Polish origin, from the customs officer René Le Brozec, a Perrosian who cultivated potatoes there and dried lichen and fish.

[1] After 1900, the date of Bruno's death, his daughter, Sofia Abakanowicz, who had become Madame Poray, had the manor extended by a wing to the west in return on the rear facade.

Images of this château on its islet are often used to illustrate postcards and tourist guides of the fr:Côte de granit rose, Côtes-d'Armor and Brittany.

The islet is part of the Natura 2000 protected zone Côte de granit rose-Sept-Îles[2] Several personalities have stayed or lived in Costaérès: