Today I went to take a look - pics are below. As I was snapping the side, I met the neighbour who told me about the history of the place. She got this from Esther, the last remaining descendant of the family, who died some years ago. The dairy hasn't produced milk since 1957. The family was one of the first group who were supported to emigrate in the 1880s (along with other eminent families such as the Smorgons). They came from Poland.
As you can see, the signs are barely visible now and won't be around for much longer:
The dairy was sold last year - and a fact sheet on its history has been compiled by the Carlton Community History Group: http://www.cchg.asn.au/dairy.pdf. Here's an image version: