‘Built in 1844 by John Frederick Hilly, architect, for Oswald Bloxsome, the house was purchased by a syndicate in 1885 and its grounds partially subdivided. The house, located near Spofforth Street between Rangers Avenue and Brierly Street survived until 1912’ [now known to be 1914] ‘when, despite protests by the local community, it was demolished for further residential subdivision’.
Source
Joy Hughes (ed), Demolished Houses of Sydney, Historic Houses Trust of New South Wales, Glebe, 1999, p 120.
(Mosman Library)
Lost Mosman 
Hello, the correct spelling of the owner’s name is Oswald Bloxsome. Thank you, Tim Hughes (a g-g-g-g-grandson and no relation to Joy Hughes)
Thank you. We will make the correction.
Gorgeous home – such a pity it had to go to make way for progress.
Wondering if anyone knows if this house was being used for any purpose or anybody in 1913?
I should have added that my Grandmother was born in the area in 1913 and the birth mother was listed as residing at Brierley St. She was adopted out to Leslie and Alice Buchanan who were also living in Mosman at the time.
Iin the 1980’s i operated a horseback trekking business known as the Great Aussies Pub crawls on Horseback that did regular treks across land known as Rangers valley that had been owned by Oswald Bloxsome before his move to Sydney into his new residence he named Rangers in Mosman. Rangers Valley is still a huge cattle breeding operation with a magnificent 1980’s style mansion that Oswald had built. He had a descendant Scott Bloxsome who was a renowned horseman / horse breaker in the region when I was doing my tourist oriented horse treks through Rangers valley