Casa de Piedra is a Spanish Colonial home built in 1875, and the name describes it precisely: the walls are thick-cut local stone, a construction method unusual enough in Aguadilla that the building became known by its material rather than its owners' name. The stone walls kept the interior cool in the heat and gave the house a solidity that has seen it through nearly 150 years of Caribbean weather, including the hurricanes and earthquakes that levelled less robustly built neighbours.
The building stands in the southern part of the historic centre and is listed for its architectural distinction. The facade is austere by the standards of ornate Spanish colonial design — the stone does the work without much decorative help — but the proportions are confident and the craftsmanship in the stonework is evident on close inspection. Like the Cardona Residence, it is primarily a building to appreciate from the street, as it is in private use.