Building from 1932, a good example of the Asturian Modern Movement. It was promoted by the Indian Francisco Marcos Purón, who made his fortune in Puerto Rico, in the city of Borinquen, hence the name of the building. Instead of promoting the typical mansion he built a modern apartment building to face the lack of housing that Llanes presented at the time. The project is by the architect José Ortiz García.

It has been considered the most rationalist building of those promoted by the Indians in Asturias. It stands out for its horizontality, decorative containment, extreme functionality and the use of novel materials for the time such as the concrete slab slab or the fiber cement roof. Its facade is totally disorganized.