2015 Heritage Impact Statement for Cassola, 20 Riverstone Road, Riverstone Cassola at Riverstone is an early homestead dating from the late 1890s ArchitecturalLocalSydney - WesternHeritage Assessment Authors: Dr Sue Rosen and Mr Martin Pickrell Client: Castle Hill Development Group This heritage impact statement comments on the adaptation of historic residence, Cassola at 20 Riverstone Road, a listed heritage item on the Blacktown LEP, for use as childcare centre in a new subdivision.