The remains of Ingenio Antongiorgi are just south of PR-2 between Yauco and Sabana Grande.  When located on a map, they barely lie within the municiaplity of Guanica just a few meters from the boundary with Sabana Grande.  They lie in what today is "Finca Vista Hermosa", a cattle farm where an employee there said the ruins were of what was the Ingenio Antongiorgi.  ​

These ruins have sometimes been identified incorrectly as Ingenio Amistad.  Ingenio Amistad was located southwest of the town of Lajas off of PR-116 and belonged to the Vivoni family.  This was verified this with a member of the Vivoni family born at the Amistad.  The Vivoni family member verified that this hacienda was indeed owned by the Antongiorgi family and that these ruins had at no point in time any relationship to the Vivoni's.

The member of the Antongiorgi family that owned this property is unknown to me at this time.  It is possible it was Juan Maria Antongiorgi Paoli (1799-1888) who also had ownership in Hacienda Florida and Hacienda Maria in nearby Yauco.