[A] A tower and chapel already existed in 1776, when Claudio Muscati Xiberras was granted the title Marchese di Xrob il-Għaġin.

[2] The tower consists of three rooms at ground floor level used for residential purposes.

[2] The two-storey, L-shaped tower has a plain external appearance, while the lower part has a slight slope.

The tower has small window openings and machicolations (Maltese: gallarija tal-misħun) for throwing projectiles or boiling liquid onto besiegers.

[2] St Paul's Tower was included in the Antiquities Protection List of 1932[5] and was classified by the authorities as a Grade 1 national monument as per Government Notice number 1082/09.