British troops and the British military headquarters were briefly quartered in the barracks during the period of Cretan autonomy. Thereafter, the first section which now houses the Prefecture was turned into the Heraklion High School. In 1921 the building housed the town's second high school.
Conversion into a High School
biographies

The former Turkish barracks were used to house the Heraklion High School. The same building complex now houses the Nomarchia (prefectural authority), the courts and the police headquarters, 1900 (R. Behaeddin, No 76, Michalis Papadakis-Dandolos Collection)
Heraklion Gymnasion (High School), now the Nomarchia, in Eleftherias Square (Yiorgos I. Panayiotakis)