Dukat used Sisko’s office on Terok Nor when he was Prefect of Bajor, so he had a presence there for sure. I find it difficult to believe however it was the prefects’ and what must have been a massive support staff’s permanent working space during a fifty years long military occupation responsible for the deaths of “tens of millions [of Bajorans]” Covenant.
If I understand correctly, Terok and Empok Nors were primarily uridium ore refinement centers. Memory alpha says the spaceport “served as a command post from which the Cardassian Prefect of Bajor, most notably Gul Dukat, oversaw the military aspects of the Occupation”. So maybe just one of many command posts? Other more prominent and typical ones?
Was an ore refinery really the main administrative facility for this huge military endeavor? Seems kinda unlikely.