2021 8A Britannia Street Pennant Hills - Heritage Impact Statement View of the newly subdivided Blackacre Estate, c.1905. Hornsby Shire Blackacre Estate, Pennant Hills. via Hornsby Shire Recollects ArchitecturalSydney - NorthernHeritage Assessment Author: Dr Sue Rosen Client: Private Client We assessed the heritage impact of the development application for the construction of a new two storey residence at 8A Britannia Street, Pennant Hills on the significance of individually listed 8 and 12 Britannia Street and that on the nearby The Crescent Heritage Conservation Area. IThe application was for the construction of a modestly sized, traditionally styled residence.