I'm not sure i would agree with you Alan, as that would mean that, for some reason, the numbering went 72 (adelaide Arms, number confirmed in directory) then erskine St, then 75. I don't think that would be very likely. My identification attempted to correlate the known 87 and 72 with the buildings shown on the map . The map is mid 1880s and the the building i put as no containing 77 is wider than most of the plots and might well have , in that earlier time, have been two plots. I doubt if we will everknow for certain though.