Necessarius Women's Dormitory

The women's dormitory of the Anglican Church has several characters living in it, including Kanzaki Kaori and Sherry Cromwell to begin with. Later Orsola and the Agnese forces also moved into here.

This dormitory is known to many magical factions, as it serves as bait to anyone who seeks to attack the Anglican Church. The idea is that if magicians attack there less civilians would be hurt than if elsewhere is attacked.

The dormitory has various defensive spells casted on it, as shown by Sasha's reaction in SS1.

Chronology
In Volume 7 (Anime 2nd season ep16) it shows Kanzaki talking with Tsuchimikado on the phone, and also Agnese moving in with Orsola.

In SS1, Sasha Kruezkev visits this dormitory to scout out the attitudes of its residents on the subject of the coming war.

In the UK Civil War arc, all the residents evacuated from the dormitory as the Knights Faction took over London under martial law. Tatemiya braved the Knights' guards and the defensive spells on the dormitory in order to retrieve the 'fallen angel maid costume' and the 'ero-fallen-angel maid costume' that Tsuchimikado sent Kanzaki, thinking Kanzaki will need it but forgot to pack it. Kanzaki was not amused by Tatemiya's actions of retrieving something she didn't want to take with her, and it lead to a discussion about cosplay among the various factions of nuns present at the time.