Hall of Speakers
The Sign of One's headquarters is a marked contrast to the normally dour, heavy and dark buildings chosen by many other factions, especially the Harmonium. The Hall of Speakers is a soaring, almost graceful structure that rises like a spire over the Clerk's Ward. This is the seat of everyday government in Sigil. Here the factols and plebeians meet to debate the few laws and ordinances of the city. More often than not, the Speaker's Podium is a forefront of the war between the factions. On a regular day, the factol of the Xaositects is likely to propose getting rid of the Harmonium guard, which instantly gains the support of the Doomguard, since the move is sure to promote chaos and decay. The Harmonium counters by demanding the arrest of the Xaositect factol, promising the Mercykillers that they can administer the punishment. On and on it goes, as factions attempt to recruit political allies, until somebody - usually the Guvners - manages to kill the whole issue on a point of order. The chant is, real lawmaking in Sigil's a rare event.
It makes sense that this place is the Signers' headquarters. Where can a berk be any more at the center of his own multiverse than on the Speaker's Podium? Unlike the other factions, where all the speaking's left to the factol, the Signers like to rotate their followers through the Speaker's chores, giving each a chance to address all of Sigil. 'Course, the factol always makes sure he's the one speaking anytime there's an important vote (this is his multiverse more than anybody else's, after all).
Most of the Hall of Speakers is open to the public for a fee. The Hall's got council chambers, meeting rooms, private apartments, and more; these can be leased for official uses. The heart of the Hall is private faction territory, however. Here, the Signer's hold their own sessions and plot their many-branching courses, but how they agree on anything is anybody's guess. It can be pretty tough for so many centers of the multiverse to agree on even the smallest issue.
The streets around the Hall are noteworthy in that the lodgings are expensive and the drink strong. There's little in the way of entertainments, and the choice of adventurer services - armorers, weapon-smiths, map dealers, etc. - is limited. There are a fair number of street-corner criers and scribes for hire.
Note: The Hall of Speakers originally appeared in the Planescape AD&D campaign setting from TSR. Additional information can be found in In the Cage: A Guide to Sigil. Their use here is for the purposes of providing context for the campaign only.