(female) false black widow
KMU004. At the top of the stairwell inside the communications building by classic theridiid webbing. Rather large, abdomen could have been 7-8 mm in diameter.
Last three pics are of the same individual, but taken by Ryan Kaldari.
Steatoda grossa, commonly known as the cupboard spider, the dark comb-footed spider, the brown house spider (in Australia), or the false black widow (though several other species are known by these names), is a common species of spider in the genus Steatoda.