The question asks about a specific historical event related to the transformation of a building in Haryana into the official residence and office of the Governor, known as Raj Bhavan Haryana.
The building known as the Circuit House in Haryana underwent a significant conversion. It was repurposed to serve as the official residence and office for the Governor of Haryana.
Following this conversion, the building was officially designated as Raj Bhavan Haryana.
This important transition, marking the establishment of the Governor's official abode and workplace as Raj Bhavan Haryana, took place in the year 1966.