The Tower of Bellesguard is a detached, single-family dwelling, built in the neighborhood of Sant Gervasi. The building was commissioned by Maria Sagués and Gaudí designed it to stand alone, with a marked cubical volume and a slender angular tower. The house took the name Bellesguard because it was built on the ruins of a residence of the Catalan monarchy with the same name.

It is structured in five levels (half-basement, ground floor and first floor, and two attics, the second being a loft); in the interior, with a rich atmosphere, he applied original building and structural solutions. The staircase stands out, which is lit by a stained-glass window of intense colors, which juts out in a sort of star shape towards the exterior and the roof, structurally resolved with the two levels of the attics, one for support and the other to top it off.

Although the building is made entirely of brick, Gaudí covered the exterior with slate from the area, thus maintaining a dialogue with the nature of the surroundings. The tower that tops off the house comes to a needle point, covered in glazed tiles with the colors of the Catalan flag, reminding one, despite the passing of time, of the noble origins of the property.

While building the house, Gaudí changed the course of an old path that crossed the property. The change in the course, made between 1903 and 1905, resulted in a semi-viaduct of brick and stone, known as the porches of Bellesguard, is partially visible from the street, while the house, surrounded by gardens, remains a private residence.

Building declared Cultural Item of National Interest since 1969.