What looks, at first glance, like a slight rise in a pasture field in County Kildare is, on closer inspection, the collapsed remains of a rectangular building, its stones now barely breaking the surface of the turf. The structure survives as a low, almost square cairn of tumbled stone, roughly 6.8 metres by 6.6 metres and no more than a metre high, with a single external corner visible at its south-western edge where rounded boulders push through the sod. That exposed stretch of walling, just a metre in each direction, is almost all that remains above ground of what the first edition of the Ordnance Survey six-inch map recorded as a rectangular building some 16 metres long and 6 metres wide.

The building sits at the northern foot of a long, gentle slope of pasture, immediately east of a possible late-medieval field system and roughly 75 metres north of a ruined tower house known locally as Offaly Castle. A tower house, for context, is the compact fortified residence typical of late-medieval Ireland, built by Anglo-Norman and Gaelic lords alike between roughly the fourteenth and seventeenth centuries. The proximity of this collapsed structure to both the tower house and the field system suggests it may have formed part of the same late-medieval settlement, perhaps an outbuilding, a barn, or some ancillary structure attached to the castle's working landscape. No firmer identification has been established, and the relationship remains tentative.