Edificio de las Cajas Reales, Colonial administrative building in Pachuca, Mexico.

The Edificio de las Cajas Reales is a colonial structure with white quarry stone detailing on its facade, forged iron balconies, and small towers. It spans two levels and features a central courtyard typical of administrative buildings from this period.

Construction began in 1670 under Viceroy Antonio Sebastian de Toledo to collect taxes and distribute mercury for mining operations. The building was central to colonial infrastructure supporting silver production in the region.

The building's name comes from the royal coffers that collected taxes here from 1666, gathering silver from the four mining districts of Pachuca, Real del Monte, San Miguel El Cerezo and Atotonilco el Chico. It also stored the mercury used to process silver and the seals marking the royal fifth. In 1865 Emperor Maximilian stayed here as a guest of the mining company director.

The building sits in central Pachuca and is easy to reach on foot from other colonial monuments and squares. Visitors should come earlier in the day when sunlight shows the stonework and details at their best.

In 1766, a pivotal moment in labor history unfolded when miners entered the building to free imprisoned colleagues. This event shows how the site connects deeply to local mining worker history.