1999 Heritage Impact Statement - Alterations & Additions at 11 & 13 Hillcrest Ave, Gladesville 13 Hillcrest Avenue, Gladesville in 2006. [Source: "Property Report for 13 Hillcrest Avenue, Gladesville NSW 2111." Domain, 25 Jan. 2021, www.domain.com.au/property-profile/13-hillcrest-avenue-gladesville-nsw-2111]. ArchitecturalLocalSydney - InnerSydney - NorthernSydney - WesternHeritage Assessment Author: Dr Sue Rosen Client: The home owner A rear extension to a single storey residence in the isler Heritage Conservation Area, pqrt of a 1912 subdivision.