MLS Type Triplex, Assessor Type SINGLE FAM RES, HALF PLEX

[Brian Zitzow]

I was looking at a property today and the MLS has it listed as a Triplex, fully rented.

I looked it up on the county tax assessors website and the last time it was assessed it has a property type "SINGLE FAM RES, HALF PLEX". I'm assuming this means the current owners converted it to a triplex. 

Does it need to be re-assessed properly? 

Are there costs this could incur if I choose to pursue this property?