1931 Robson Street was on the north side of Robson Street, west of Gilford Street. It seems to have existed between 1900 and 1906
Legal Description: District Lot: 185, Block 65, lot 39.

1931 Robson Street, detail from Insurance plan – City of Vancouver, July 1897, revised June 1901 – Sheet 43 – Coal Harbour to Comox Street and Bidwell Street to Stanley Park.

1931 Robson Street, detail from Insurance plan – City of Vancouver, July 1897, revised June 1903 – Sheet 43 – Coal Harbour to Comox Street and Bidwell Street to Stanley Park.
There are no references to this property in Heritage Vancouver Society’s database of historic building permits: http://permits.heritagevancouver.org/index.php?cID=1 [searched January 13, 2019].
Gabriel Thomas seems to have been associated with this house for most of its existence, and he may have been the owner. He lived in the house, and he leased portions of it from time to time.
In 1904, the house was for sale.
Vancouver directory listings for 1931 Robson Street.
1900 to 1902; 1904 to 1905 | Thomas, Gabriel, Junior |
1903 | Shrapnel, Walter Scrope |
1906 | Lindsay, Percival Kingsford |
It appears that the house was moved or demolished after 1906.
By 1909, a large new house was on the property, with an address of 1933 Robson Street. Further information appears on the page for 1933 Robson Street.