Santa Elena
Toa Baja

According to Jaime Bague in his publication Del Ingenio Azucarero Patriarcal a la Central Azucarera Corporativa  Santa Elena was established in 1778 just west of La Plata River by Juan Rijos Feduchi, a European immigrant who came to Puerto Rico from the Dominican Republic.  Lizette Cabrera Salcedo in her book De los Bueyes al Vapor states Santa Elena was established during the last decade of the XVIII Century.  José Ferreras Pagán in his 1902 book  Biografía de las Riquezas de Puerto Rico  states that Santa Elena was established in 1790 by Juan Rijus (sic) Feduchi.

Steam power technology was not introduced in Puerto Rico until 1831.  According to Ferrerás Pagán, under the ownership of a Dr. Figueras, Santa Elena was the first sugar factory to turn to steam on the North part of the island sometime between 1831 and 1839.  Jaime Fonalledas acquired acquired Santa Elena in 1891 and by 1917 all the sugar processing equipment had been dismantled and sold as scrap.  It consisted of approximately 500 cuerdas of which 100 were used to grow sugarcane. 
Even though it is improbable that the remains pictured are from the origins of the hacienda in 1778 or 1790, they are nonetheless the only remaining structure on the island of an 18th Century ingenio, and the only one where the mill on the ground floor was driven by oxen on the second level.