After the disappearance of the old stone belfry in the convent reforms of the early years of the 18th century, the erection of the quadrangular tower-fortress began on 13th May 1701 and was completed in a short space of time, under the supervision of the stonemason Gaspar Méndez de Abreu. It is attached to the façade of the old convent on the western side, with a masonry spire covered with Flemish ceramic tiles, made in the city of Delf in the 17th century. Also decorated on the part of the tower facing the sea is the stone coat of arms of the Dominican order, as well as the representation of the six-pointed star and the dog with the torch in its mouth, iconographic symbols of Santo Domingo de Guzmán; and the date of construction of the tower on the side facing the church.

It has three bells:

The bell facing the front of the square is a re-casting of the old metal one from Seville from the 18th century dedicated to Santo Domingo. The inscription on the bell reads: ‘SANTO DOMINGO DE GUZMAN ME LLAMO – SEVILLA AÑO 1731’.

The bell facing the steps of the square is the oldest of the three remaining bells in the tower. It is a bronze cast in 1633, possibly brought to the island and decorated with grotesques.

The bell facing Calle Párraga is the shearing or small bell that crowned the old belfry of the convent. It is interestingly decorated with the words ‘AVE MARISTELA’, i.e. ‘Ave Estrella del Mar’, separated by four stars and, in the middle, the year it was cast, ‘1767’, also flanked by stars.