File containing maps, plans and survey drawings relating to developments at Rathfarnham Castle from the offices of Donal Ó Buachalla, auctioneer and land valuer, and Robinson, Keefe and Devane Architects. Includes maps showing the location and type of trees on the property.

A file containing extensive material on the water supply to Rathfarnham castle and surrounding businesses. Includes copious correspondence concerning the upkeep of the millrace and repairs to the sluice gates to avoid flooding in the area.

A file relating to the seismograph in Rathfarnham Castle. Includes letters from Fr William O'Leary SJ to Irish Fr Provincial Thomas V Nolan SJ concerning the construction of the seismograph.