On the death of Samuel Riddel, the last of Eliza and Isabella's bachelor brothers, the sisters inherited over £400,000, which was a large fortune at that time.
[1] Ruth Duffin, the first warden of Riddel Hall, noted in her writings that the sisters were devoted Unitarians, strongly charitable, and that their habits were simple and Victorian.
[1] The Misses Riddel donated £35,000 for the building and endowment of a halls of residence, with the understanding it was to be used for the female students of Queen's University.
When funds were raised, it was normally by a piecemeal combination of ladies' halls committees, local subscriptions and grants from bodies such as the Carnegie or Pfeiffer Trusts.
Following the redevelopment, Queen's Management School (incorporating the William J Clinton Leadership Institute) was relocated to the site and officially opened by Mary McAleese[3] in 2012.