Hacienda Coto was located in Barrio Sabana Grande Abajo of San Germán, approximately 1.3 miles west of the town of San Germán, about 400m north of PR-114.  It was established in 1810 as a sixty acre plantation with an oxen driven and wooden masses mill by retired military Captain Ramón de Quiñones Quiñones (1774-1850) and his wife Francisca Martina Silva Lopez de Victoria ( -1864), who were one of he first sugarcane planters in the area.  Originally, Hacienda Coto produced molasses for sale in the local market.  By 1835 additional land had been acquired and by 1852 it was a four hundred fifty acre plantation and one of the largest in the area with its own open and vaulted canal system for irrigation.   

The Quiñones Silva and Quiñones Quiñones family were not only related but they were neighbors as  Hacienda Coto of the Quiñones Silva family was adjacent to hacienda Filial Amor of the Quiñones Quiñones family.  Ramón and Francisca had eight children some of whom married cousins as was customary at the time in order to retain wealth within the family.  For example Vicente Maria Quiñones Silva married Amalia Quiñones Ramirez de Arellano, Filomena Quiñones Silva married José Maria Quiñones Quiñones owner of Hacienda Santa Rita, Inocencia Quiñones Silva married José Marcial Quiñones Quiñones and Cándida Quiñones Silva married José Marcial Quiñones after the death of her sister.

When Ramón de Quiñones Quiñones died in 1850, the administration of the hacienda relied on his widow Francisca and their four male sons; Vicente Maria Quiñones Silva ( -1883), Celso Macario Quiñones Silva (1828-1901), Eleuterio Quiñones Silva (1831-1914) and Rudesindo Quiñones Silva.  During the four sons administration, in 1852 a steam mill was installed which substantially improved the volume and quality of the sugar produced.  Upon Francisca's death in 1864, her estate consisted of several properties which included Hacienda La Concepcion in Barrio Espinal of Aguada and Hacienda Coto.  Hacienda La Concepción was purchased from the estate by their daughter Eulalia Quiñones Silva (1837-1888) who was married to  José Nestor de Cardona Ramirez de Arellano (1833-1905) and Hacienda Coto was split between their four sons with Vicente Maria inheriting one hundred forty four acres, half of the canal system and the sugar factory.  When Vicente Maria died, the hacienda passed on to his widow Amalia Quiñones Ramirez de Arellano (1815-1889), then to their son Ramón Quiñones Quiñones (1857- ) and then to his widow Isabel Salazar de Gurendes y Lantarón (1861- ).  The fourth generation owner of the hacienda was Ramón and Isabel's son Ernesto Quiñones Salazar (1879-1942) and his wife Josefina Sambolín Becchi.  The fifth generation and last family member to own and operate the hacienda was Ernesto Quiñones Sambolin (1911-1993).

Its ruins include the owner's two story house, chimney and walls of the building that housed the steam mill, constructed in 1852 during the administration of Francisca Silva López de Victoria, the widow of its original owner Ramón de Quiñones y Quiñones.  This hacienda was documented in a 1977 American Historic Engineering Record (HAER Report) which contains drawing and pictures by Jack Boucher and Fred Guessing.