The various articles also seem to agree that low end, smaller units, and central locations are doing the best. So Downtown and or City Heights studios outperformed RSF houses in percentage increase.
Zumper seems to show the biggest numbers because it is SD city only and limited to apartments of 1 or 2 bedrooms. Trulia shows a lower figure because it is the entire county and inclused high end and SFH rentals.
I have one condo and one SFH rental in OB market. Very clear that the market rent on the condo went up a lot more the past year than the SFH. Very low supply in both markets.
Just learned the large new Dylan Point Loma complex is now fully rented, all 1 bedrooms at 2300+/mo. Only reason it even got built is the city closed and sold an elementary school on a large lot.