Number 9 And Attached Railings

Number 9 is the Treasurer's house of the old St Thomas's Hospital, which later became part of the Chapter House Annexe and is now used as offices. It was built around 1706 and features brown brick with red brick dressings and a slate roof with dormers behind a brick parapet. The building has three storeys, a basement, and an attic, with a total of seven bays.

The left section has a wide, early 18th-century doorway adorned with panelled Doric pilasters and carved scroll brackets that support an enriched cornice and a broken segmental pediment. This doorway originally led to a covered passageway towards Edward Square, which was part of the old hospital. There is a later door with a fanlight and multi-light margins to the right, along with a second doorway featuring panelled pilasters, scroll brackets, and a broken pediment. The first and second floors have sash windows with glazing bars set in stucco-lined reveals, flat gauged-brick arches, and rubbed red brick surrounds. Brick string courses run between the floors.

The rear (north) elevation is treated similarly to that of the adjacent former Church of St Thomas, although the levels do not match. It has flat gauged-brick arches over sash windows with glazing bars and Ionic pilasters that rise through two storeys to a modillion cornice. The interior has been altered for office use but retains some notable features.

Additionally, there are cast-iron area railings dated 1852. Number 9, along with the rear of Number 9A, is considered one of the more important examples of Queen Anne architecture in London. It forms a group with Number 9A (the former St Thomas's Church and later Chapter House) and Numbers 11-15 (odd). Number 9 was listed on September 27, 1972.