The center photo shows Richmond House (1st generation).
My guess its around 1930 as the next one in this (Highfill) album is already uploaded https://gwulo.com/atom/24858 (attributed to eternal 1966b, dated 1930's).
Any other clue regarding the date?
Source: This image came from Flickr, see https://flickr.com/photo.gne?id=15156932429
Date picture taken
1930s
Gallery
Shows place(s)
Comments
Another photo from the set -
Another photo from the set - https://www.flickr.com/photos/sdasmarchives/15343395702/in/photostream/ - should have been taken in 1935 or earlier, as all of the Queen's Gardens buildings are still standing.
Photo Date Range
In addition to the Queen's Gardens photo, another photo from the set - https://www.flickr.com/photos/sdasmarchives/15156994050/ - shows the fourth storey of the timeball tower at Signal Hill which would indicate the date the photo to between 1928 and 1933 as explanined here
In this photo from the same set - https://www.flickr.com/photos/sdasmarchives/15155271639/ - King's Theatre has not been built. This would narrow the date to between 1928 and 1931. Your guess about 1930 would be about right looking at buildings on the Praya East Reclamation .