The Council Hall, where the members of the sultan's council would work on state business.
The Ottoman Sultans would not participate in the meetings held at the Council Hall (Kubbealti). Most of the times they would follow the deliberations of the Council in a room of the Tower of Justice from behind a grilled window overlooking the Council Chamber. When the Sultan disagreed with a particular decision of the Council, he would close the window curtain as a signal to terminate the meeting. In such case, the Grand Vizier and viziers would then proceed to the Audience Chamber in order to continue their consultations on the subject matter in the presence of the Sultan. (Miniature of a Council meeting and d'Ohsson engraving).
I found the architecture interesting. The interior of the Council Chamber is separated from outsiders only by gilded grids. So, in some ways the deliberations of the Council were non-confidential and public. There's a contemporary description of thousands of people standing quietly in the courtyard while discussions were underway. Yet, the architecture also coincides with the sultan's ultimate power. He followed the Council meetings from a grilled window which kept him literally separate and above the proceedings. Although he had delegated some powers to the Council, he remained the ultimate authority.
When the sultan disagreed with a decision, he would close the curtain on his grilled window and deliberations would end, to be resumed, perhaps, privately in the Audience Chamber in the Inner Courtyard.