Actually the MLS in San Diego county is run by Sandicor and is subject to rules and regulations set forth by SDAR. When we commonly refer to inventory we assume those are active homes for sale on the MLS. Not pendings or withdrawn listings. Currently the MLS calculations for active listings are defined as listings active for sale in the zip codes between 91901 and 92173. There were 19715 properties.
Now I also know that both sdr and Jim have reported instances of MLS listings either not being accounted for or disappearing. This may indeed be true. Indeed this does not count FSBOs or any other sales not on the MLS.