Assessor vs sell price

[Abou C.]

Driving for dollars found some great fourplex but off market and I would like to contact owner or send yellow letters.  New to this, but is the assessor price quote relative to potential selling price besides what ever can be negotiated?. 

Example: fourplex

Assessor site: 207K

I am assuming if sold it will be around price or under depending how distressed?.