This building was constructed by the Franciscans in the 16th century. It was built in two stages, the first from 1530 to 1540, and the second stage from 1590 to 1600. It was designed and directed by Fray Juan de Alameda with the assistance of Fray Diego de Olarte.

It has an atrium surrounded by a wall with battlements, giving it the appearance of a fortress. In the center, there is a large stone cross. It also features an open chapel, poza chapels, and a pilgrims' portal.

Within the complex, there is a temple with a single nave and Gothic ribbed vaults.

The facade has a neoclassical style with columns supporting a pediment that houses a figure of the Virgin of the Assumption.

As for the cloister, it consists of two floors. The first floor includes a refectory, kitchen, and "sala profundis," while the second floor housed the friars' quarters.

The central courtyard of the cloister is surrounded by four robust cylindrical arches on each side with their respective columns. In the center, there is a beautiful fountain known as the "Fuente de los Sabores," built-in 1560 by indigenous hands but with clear European influence.

In the hallways, some ancient sepia-colored paintings of flowers and the royal crown can still be distinguished. On other walls, there are figures in the form of felines and feathers, as well as the coat of arms of Tochimilco, depicting four local legends.

Another important element that has been preserved is the aqueduct with an octagonal fountain in the town square. One of its pillars stands out with a shield from Ocopetlayucan dating back to the 16th century.