Cornacassa, Monaghan, Co Monaghan
Mark Bence-Jones. A Guide to Irish Country Houses (originally published as Burke’s Guide to Country Houses volume 1 Ireland by Burke’s Peerage Ltd. 1978); Revised edition 1988 Constable and Company Ltd, London.
93. “(Hamilton/LGI1912) A restrained and dignified early C19 Classical house of the school of Francis Johnston…. Now demolished.”
Listed in Vanishing Country Houses of Ireland by The Knight of Glin, David J. Griffin and Nicholas K. Robinson, published by The Irish Architectural Archive and The Irish Georgian Society, 1988.
p. 119. …built for Dacre Hamilton. Demolished but the stables remain.
https://archiseek.com/2016/cornacassa-house-monaghan-co-monaghan
1820s – Cornacassa House, Monaghan, Co. Monaghan
A dignified smaller classical house with a lower service wing. Described in Lewis as “Cornacassa, of Dacre Hamilton, Esq., pleasantly situated in a highly cultivated and well-planted demesne”. In the 1870s, the Hamiltons owned over 7,300 acres in Co. Monaghan. A large sale of the library contents was held in 1922. Demolished.
Detached five-bay house, built c.1800, having two-storey front (north-west) elevation and three-storey rear elevation. Formerly part of Cornecassa House. Hipped slate roof, with rendered chimneystacks, and replacement rainwater goods. Snecked limestone walls with tooled sandstone block-and-start quoins. Square-headed window openings throughout, having tooled sandstone surrounds, tooled stone sills and replacement uPVC windows. Square-headed door openings to front and north-east elevations, with tooled sandstone surrounds and replacement timber and uPVC doors, front having over-lights. Front doorways open onto concrete paving bridging basement area, with rendered parapets. Coursed rubble limestone boundary wall with limestone coping to north-west of house, surrounding former walled garden.
Appraisal
Built c.1800 for Dacre Hamilton, Cornecassa House was subsequently partly demolished. Despite the loss of the main house what remains is architecturally interesting. The good-quality masonry with tooled details formalises this interesting split-level building. The demesne also incorporated an impressive walled gardens and a range of outbuildings, some of which can still be seen. 
Irish Historic Houses 