Since writing a specialised article about small parks, I have now at least made it something of a challenge to write about the ten smallest parks on my list of Brisbane's smallest. I wanted it to start with Brisbane's and the list's smallest, namely, Roseglen Street 54A Greenslopes about a kilometre walk from the Greenslopes Mall near well-known suburbs of Woolloongabba, Holland Park and Stones Corner. My research shows it is the smallest in area on a list of 2173 parks (with the Mt Coot-tha Reserve the largest) and it can also be a small side trip in a visit to Greenslopes.
The best way to see this park is through the entrance to the larger more ample park space behind the street and walk it as normal and photograph responsibly, respecting the privacy and rules around that of the owners on either side. In terms of a visit, you could easily park at Greenslopes Mall and walk there, or alternatively a side trip if waiting or hiking or cycling around the area and so forth. There is an alternative way out of the larger park behind the street, at 38 Roseglen Street, it's a remarkable fortune in fact because 38 Roseglen Street is a narrow lot just like 54A but, is part of the larger park, while 54A which is access, is a separate park.
In terms of what I experienced on my visit there, it was muddy and small - the photos don't do it justice, but I can imagine, it's about five metres across by ten metres long, but those car tracks you see, they are narrower than I thought they'd be. There's virtually nothing to it, which adds to the mystique, it was in fact, surprisingly good and quite convenient to the local mall, an ideal excursion, and the old leafless tree is quite spectacular as you emerge from the blocked driveway into the large 38 Roseglen Street Park.
In terms of my research, I saw the park prior to my visit on Google Maps, and it appeared to be a little green that is just obvious enough to look like it has been designed as a park space - but that is actually private property, the real park is found between two houses as an entrance to a larger park. Upon further searching, I found that 54A is a little entrance, an anomaly of some sort. It's an access point to the larger Roseglen Street Park that hugs the South East Freeway, and that little entrance, was geographically designated as a park, as it's not a lane, it's not big enough to build on, and there are houses on either side, so, for now, it remains Brisbane's smallest official park, at just over one-quarter of the area of the far more iconic Clark Lane Park on Queen Street.
How it got to that point of Brisbane's smallest park is quite fascinating. The nearby Greenslopes Private Hospital was built from 1940-44 according to its history linked here while land on its eastern side was developed much earlier. I think houses on Roseglen Street were built around the 1930s but I can only really hint at that. Just to clarify, the green outside the homes adjacent is private property, but the lot 54A, laneway type entrance to the larger Roseglen Street Park is public space and has been so for quite a while. This allotment is visible on Google Maps as 54A Roseglen Street.
Just in terms of this park's place in national records, for all sorts of reasons, it's near impossible to work out Australia's smallest park (I found asking Google didn't give any decent answer nor did my searches by state), but 54A Roseglen Street has surely got to be up there with the smallest in the country. I claim the answer is there because modern geographical software makes the park areas easy to generate yet hard to search for in its practicality.