Cape San Juan Light in Fajardo The full project consisted of restoring 15
lighthouses of Puerto Rico, which were in varying states of decay. As the priority was architectural conservation, Cueto's first step was to analyze the history of the lighthouses. They were built between 1880 and 1882 by the Spanish Government in a style of
masonry common in traditional Puerto Rican building. The walls are made of limestone, sand and lime, with horizontal rows of mud bricks and feature flat roofs of wooden beams with rafters in three layers. The outermost roof was utilized to channel water to the
cistern for drinking water. After the Spanish–American War of 1898, the lighthouses became the property of the United States Lighthouse Service, which would later be part of the
United States Coast Guard and they remained in use until the 1970s. They had been vacant for about ten years when the restoration project was launched in 1988. Del Cueto's major lighthouse restoration work covered the
Cape San Juan Light (Faro de Las Cabezas de San Juan) in
Fajardo, the oldest of Puerto Rico's lighthouses. The one-story stone,
neoclassical style keeper's house is attached to a cylindrical stone tower, The immediate issue was prevention of further deterioration of the site and to assist in that effort, it was placed on the World Monuments Watch List in 2004. In the assessment phase, Cueto used
ground-penetrating radar, one of the first such uses of that technology in the
Caribbean. The technology allows assessment without invasive testing which might result in further damage to the site and gives insight into subsurface conditions which may not be visible. The series of analysis took place over a four-year period identifying multiple renovations and alterations over the 478 years of life of the structure. Once the assessment phase completed, conservation and repairs began which were not completed until 2012. ==Works==