Whatever structure once occupied this spot has left no visible trace at ground level, yet the documentary record suggests something was here long before the current building arrived.

The earliest cartographic evidence comes from the Down Survey of 1655 to 1656, the ambitious land-mapping project commissioned by Oliver Cromwell to catalogue confiscated Irish territories. That survey marks a dwelling at the precise location later identified as Kilcoskan House on the Ordnance Survey six-inch map of 1937. The site appears again on John Rocque's map of 1760, a detailed survey of County Dublin that remains one of the most reliable cartographic sources for the region in the eighteenth century. Taken together, the two sources place a house here across at least a century of recorded history, and the 16th to 17th century dating suggests the origins of occupation may be earlier still. The natural rise on which the site sits, modest as it appears today amid the surrounding level grassland, was likely a deliberate choice, offering drainage and a degree of visibility in an otherwise flat landscape.

There is little for a visitor to observe directly. The archaeological and historical interest lies almost entirely in the layered record rather than in any standing fabric, and the presence of a private residence on the site means access is not a straightforward matter. The value in knowing this place exists is perhaps more cartographic than physical: a dot on a mid-seventeenth-century survey that persists through Rocque's careful draughtsmanship and into the Ordnance Survey record, marking a spot in the Dublin landscape that has quietly held its significance across several maps and several centuries.