Visited April 2009. There are two Dalquharran castles in close proximity, easy to find due to the prominant position of the later house on a raised sight looking over the village of Dailly.
The oldest castle was built in 1679 and was replaced between 1789-92 by the 'new' Dalquharran castle. This was built by Robert Adam for his brother in law Thomas Kennedy. It shares much of its style with Adam's masterpiece Culzean, also having a circular drawing room. The castle was enlarged in 1881 with the addition of the lower side wings.
The house is due to be turned into a mega leisure complex, therefore there's tight security in the form of fencing around the entire site and entrances to the castle. The rooms appear to have been cleared of debris and a few building materials lay in the courtyard but there is no sign of work and the site was unsupervised on my visit.
Starting with the oldest castle:
View of the later castle from the older one:
The later castle:
Impressive view from the distance:
A few interiors visible through windows: