In 1966 it was bought by the Rollins family, who began the difficult and time-consuming job of totally renovating the building.
It was renovated by the Rollins family, who purchased it in 1966. 
mnli hypothesis: It was renovated by the Rollins family, who purchased it in 1966.  premise: In 1966 it was bought by the Rollins family, who began the difficult and time-consuming job of totally renovating the building.