some directory listing for 49 Lwr Sackville St (mentioned in the article Anne posted.)
1848
Edward Smith & son, timepiece makers to Her Majesty's General Pot Office
1850
Vacant
1852
Graham Lemon & Co, confectioners
1863
Graham Lemon & Co, Wholesale confection, lozenge and comfit manufacturers
to the Queen and Castle, also office at 140 Stephens Grn West.
Residence - St. Edmonds, Clontarf
1870s
same details as 1863 - res. now Yew Park, Clontarf
1884
Lemon & Sons (other details as before)
Res. Yew Park, Clontarf & Ross Castle, Armagh
1894
Lemon and Co. (limited)
Thomas Owens Lemon , esq., T.C., 4 Vernon Parade, Clontarf
Shane