I could be wrong but I think any infills on 33rd/34th predate the 2014 area plan (I may have my terminology wrong) that allowed this kind of development. I think any semi-detached after that was generally built on 32nd ave or north of there.
If I recall, there was/is ongoing tension about this within the community and lots of perceptions that the retail should be "clustered" on the west end.The 2014 plan actually ended the Marda Loop ARP at 19th Street. The infills further east were apprpriate for the plans at the time. Shows some of the challenges of constantly evolving policy.