Ruins of San Agustin Mansion is a Registered Property, City of Tayabas located at Tayabas City, Quezon, Region IV-A.
The family of the San Agustin was the most prominent family in Tayabas during the first half of the 20th Century.The ruins of the mansion, located along Rizal Street highlights their prominence in the city due to its proximity to the Casa Comunidad and the parish church. Unfortunately the mansion was destroyed in the bombings of 1945. The ruins is made of reinforced concrete. They consist of two columns supporting what must have been a balcony over the main doorway. Plant motifs in bas-relief adorns over a section of the ruins.