Published rental rates are typically apartment complexes. It’s harder to get large-scale info on SFRs and condos. SFRs tend to track them however, IMO. My reasoning is that most would pay a premium to have a yard, no common walls, etc. If this premium is small, then people move out of apts and suppress those rates. Apartment rents are a good indicator.
Downtown is the monkey wrench …
I agree that downtown SD oversupply will eventually suppress rental rates in some nearby areas. Would I rather rent a 2BR apt in PB or a downtown condo if they were the same price? It depends on the number of bums (I mean transient non-occupants, to be PC) I pass while walking my dog at night.