No 23 Allen Street is a single storey house constructed in brickwork with a hipped corrugated iron roof. It is a fine simple expression of the Federation Bungalow style. The front elevation is asymmetrically planned with a full width return broken back roofed verandah. The verandah is set on timber posts with an arched timber frieze. There is an offset front door with hopper and sidelights. There are two sets of three casement windows across the front facade.
1921: A Sudden Death.Mary Bushby, a married woman, who lived at 23 Allen-street, Fremantle, died suddenly at about 9.30 p.m. on Friday. A post-mortem examination was conducted at the Fremantle morgue on Saturday, and yesterday the District Coroner (Mr. W. A. G. Walter, R.M.) opened an inquest, which was adjourned. It is said that the deceased was subject to fits. (Reference)
1927: The engagement is announced between Mavis, elder daughter of Mr. and the late Mrs. E. E. Mumford, Alexander-road, East Fremantle, to Keith, elder son of Mr. and Mrs. A. J. Leonhardt, 23 Allen-street, East Fremantle. (reference)
1927: Mr. KEITH LEONHARDT (L.A.B. Singing, Practical) has ''VACANCIES for PUPILS''. Prospectus on application. 23 Allen-street, E. Fremantle. (reference)
1936: Motorcycle registration 6179, A. R. Leonhardt, 23 Allen-street, East Fremantle, Matchless. (Reference)
1915 - 1918: Knox, Harry B.
1919 - 1925: Reilly, Henry L.
1926 - 1949: Leonardt, Alfred James