The Prefectory of Yuuzhan'tar was the building for the intendants charged with the day-to-day matters of running Yuuzhan'tar.
After he was escalated to Prefect of Yuuzhan'tar, Nom Anor's offices were located in the Prefectory, with a balcony overlooking the Square of Hierarchy. Nom Anor was in his offices when Zonama Sekot arrived in the Coruscant system.