2005 Heritage Impact Statement - 33 Sunnyside St, Gladesville Rear Addition at 33 Sunnyside St, Gladesville c. 2015. Source: ["33 Sunnyside Street, Gladesville, NSW 2111." Realestate.com, 25 Jan. 2021, www.realestate.com.au/sold/property-house-nsw-gladesville-120621625]. LocalSydney - NorthernSydney SurroundsHeritage Assessment Author: Dr Sue Rosen and Rosemary Kerr Client: Private Client We prepared this HIS for proposed alterations and a rear extension to 33 Sunnyside Street, Gladesville. The property is listed on the Hunters Hill Municipality Schedule of Contributory Buildings (Schedule 7) and is located within the Isler Estate Heritage Conservation Area.