The El Nuncio de Toledo project involved the full restoration of more than 8,000 square meters of a building designed between 1789 and 1790 by architect Ignacio Haan, a disciple of Sabatini and a leading figure in European Enlightenment-era hospital architecture. Originally conceived as a psychiatric hospital, the building stands out for its rationalist layout organized around four interior courtyards, its monumental imperial staircase, and a unique oval chapel decorated with Corinthian order elements and ornamental features of great artistic value.

After two years of construction work, OHLA completed a highly complex technical intervention designed under the strictest standards to preserve the building’s heritage value while fully adapting it to the functional, regulatory, and environmental requirements of the 21st century. The project significantly improved the building’s energy performance, achieving outstanding efficiency levels, with a 96% reduction in energy consumption and nearly a 60% decrease in electricity costs. These results were achieved through the comprehensive improvement of the thermal envelope, the complete renovation of installations, and the incorporation of advanced high-efficiency climate control and lighting solutions based on LED technology.

The intervention also included covering the four interior courtyards, the full restoration of the chapel and exterior woodwork, the rehabilitation of the semi-basement passageways, and the recovery of the historic rear ramp as an open terrace overlooking the Vega Baja area. In addition, the interior spaces were reorganized to provide greater spaciousness, natural light, and functionality, while incorporating universal accessibility criteria, acoustic protection, fire safety, and health standards in accordance with current regulations.