This is an unusual one. There is a hint from James Bettley in the latest (2015) edition of Pevsner's Suffolk East that is based on his experience alone. I know of no other mention anywhere (yet).

Under the Grundisburgh entry there is a building called Bast's "a very fine house of the late C15 and early C16." After some description he says "The two-storey E range was added some years later, but as it contains the stairs as well as the service rooms the question of how the original block functioned is an interesting one. Its form bears comparison with Thaxted Guildhall, Essex, so it may have had some institutional use before being adapted as a house."

The Historic England listing details are here and do not mention any such use.

One to ponder.

The extract(s) below are taken from one or more of the following articles in PSIAH (see the Sources page for details of how to access).

Morley, C., 1926, A check-list of the sacred buildings of Suffolk, to which are added Gilds. XIX Part 2, 168-211.

Redstone, V. B., 1904, Chapels, Chantries and Gilds in Suffolk. XII Part 1, 1-87. Has abstracts of 39 gild certificates, 18 in Bury (presumably the 1389 returns). Also details of Ipswich Corpus Christi gild.

Redstone, V. B., 1937. IV. Extracts from wills and other material, showing the history of Suffolk churches, chantries and guilds (Appendix to article published in Proceedings Vol XII). XXIII Part 1, 50-78.
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