From the 1950s to the 1980s, the Bank of Mexico located next door on Madero Street, occupied a large section of the Palacio.
The Bank made extensive modifications to its portion of the building, such as security walls, roofing the open-air terraces and the like that added a great deal of weight and stress to the steel-beam building.
This in and of itself caused damage to the building, but when the 1985 earthquake struck Mexico City, this damage was made far worse.
The earthquake also severely damaged or destroy a number of buildings nearby, so when city reconstruction efforts began, the Bank decided to move out of the Palacio and build new structures nearby to house their extra offices.
The building was declared an Artistic Monument on 4 May 1987, due to its beauty and history, and restoration efforts were begun in the 1990s.
These efforts were significantly helped by the large number of graphic representations of the structure as it originally appeared and other documents kept by the National Archives.
They were also able to locate the architect's daughter in Italy, who donated her father's plans and notes from the project.
These can now be seen at the National Museum of Architecture, in the Palacio de Bellas Artes.

Restoration began with the structure of the building, repairing and reinforcing the columns and steel beams damaged by the earthquake.
Next came the removal of the weight added to the building by the projects done by the Bank of Mexico, restoring the floors to their original weight and construction design.
Last done, was the reconstruction of the interiors that had been greatly modified and with most of the original decorative elements destroyed.
For this aspect of the work, Boari's plans and notes proved invaluable.
The restoration project also allowed for the technological upgrading of services.
From the 1950s to the 1980s, the Bank of Mexico located next door on Madero Street, occupied a large section of the Palacio. The Bank made extensive modifications to its portion of the building, such as security walls, roofing the open-air terraces and the like that added a great deal of weight and stress to the steel-beam building. This in and of itself caused damage to the building, but when the 1985 earthquake struck Mexico City, this damage was made far worse. The earthquake also severely damaged or destroy a number of buildings nearby, so when city reconstruction efforts began, the Bank decided to move out of the Palacio and build new structures nearby to house their extra offices. The building was declared an Artistic Monument on 4 May 1987, due to its beauty and history, and restoration efforts were begun in the 1990s. These efforts were significantly helped by the large number of graphic representations of the structure as it originally appeared and other documents kept by the National Archives. They were also able to locate the architect's daughter in Italy, who donated her father's plans and notes from the project. These can now be seen at the National Museum of Architecture, in the Palacio de Bellas Artes.
Restoration began with the structure of the building, repairing and reinforcing the columns and steel beams damaged by the earthquake. Next came the removal of the weight added to the building by the projects done by the Bank of Mexico, restoring the floors to their original weight and construction design. Last done, was the reconstruction of the interiors that had been greatly modified and with most of the original decorative elements destroyed. For this aspect of the work, Boari's plans and notes proved invaluable. The restoration project also allowed for the technological upgrading of services.
Palacio de Correos de México