It is known locally as the Corn Store, and its proportions alone hint at the scale of agricultural operation it once served: the rectangular structure runs some 32 metres from northeast to southwest and spans roughly 7 metres across, with single-roomed projections at either end of its northwest elevation, an arrangement that suggests deliberate functional planning rather than casual construction.

Corn stores of this kind were once a familiar feature of larger Irish estates, used to dry, measure, and hold grain before it moved to market or mill. Their association with estate grounds places them firmly within the world of improving landlordism, a period when country houses across Munster were surrounded by working farm complexes designed to extract and manage the produce of surrounding townlands. The inlet to the west, Arundelmills, carries in its name a further suggestion of that milling economy, the processing infrastructure that would have made a store of this size worthwhile. What survives today is the shell of that system, single-storey remains set into the landscape of the house's grounds, the inlet still visible to the west.