RV of my place is about 20% off my estimate of market value, so this corroborates.
It's an old building though, so there may be some "serious" disrepair factored in. Also, the rental spread is relatively large as some units aren't renovated and I could foresee some units going for close to the RV.
I wonder where RVD gets their figures... whether they do their own research, or base entirely on R1A / CR109 / Stamp Duty submissions.
... in which case I wonder how many owners under-report for tax reasons.