Lau’s territory in London 1888.
1* London Life Expectancy Statistics Reference
2 Mapping of East End from Jack the Ripper and various literary sources
1* Flickr Google Maps Capture of East End territories
2 More Air for London; Octavia Hill; 1888
Further Sources & Notes
Charles Booth Poverty Map
Based on this map and its legend, by the yellow markings one would assume the expanses of boulevards present is where Earl Phantomhive and Earl Trancy would reside.
1 Richard Norman Shaw’s Scotland Yard 1888-90 Photo
As seen by location, it is right beside Thames on the Victoria Embankment between the light blue quarters of the moderate poor and the effluent yellow quarters of the wealthy.