1910 Valuation (February 1912), a little later, but…:
Occupier: tenements
Owner: Duke of Westminster
someone called Cubitt a leaseholder I think this is a reference to Thomas Cubitt, architect
Description:
Basement 2 rooms
Landing WC
Ground, First and Second Floors all 2 rooms
Top Floor 1 room
no 15 was at the west end of the street, on the north side, next door to the Greyhound pub (also owned by the Duke of Westminster) which was on the corner of Cambridge Street and Hugh Street.
Added: looks to be still there, but the Greyhound is now the Purgatory Bar (was still The Greyhound in 2018).