Casa Hamilton, Pumping station ruins in Los Realejos, Spain.

Casa Hamilton is a roofless five-storey ruin of mortared basalt on the cliff below Romantica I, about 40 metres above sea level. Its lowest floor is a large basalt block pierced by an east-west passage; the fourth floor, the old entrance level, has arched openings, and the fifth held the pumping machine, with crane rails still on the walls. It was once one of the largest buildings on Tenerife.

The British Hamilton House bought the Gordejuela water society in 1902, having invested since 1898, and built the water lift in 1903 on the site of the Juan de Gordejuela mill. Designed by military engineer José Galván Balaguer with León de Torres and León Huerta, it cost about one million pesetas and ran Tenerife's first steam engine. Leased to Elders & Fyffes in 1910, it was sold in 1919 and later became public property.

This site reflects a period when British companies shaped the island's economy and introduced modern industrial methods to local farming. Today it stands as a reminder of how international investment changed agricultural practices in the region.

Access is through Calle Geranios in the Toscal neighborhood, where a flat path leads along the clifftop. A walk of about 30 minutes from the starting point brings visitors to the ruins.

The water was stored in a reservoir about 2 km away at 290 m above sea level, holding 12,000 cubic metres, then carried by a 12 km aqueduct to the plantations. The complex was designed by military engineer José Galván Balaguer with León de Torres and León Huerta, and cost around one million pesetas.