7/3/2018 Assessor warns of scam

"Santa Clara County homeowners beware: a mailer offering to charge $89 for a copy of a property owner's deed and assessment information is a scam..."

Full article at:

https://www.mercurynews.com/2018/07/03/county-assessors-office-warns-of-scam-against-homeowners/

From my experience, the letters are sent whenever a document related to real property is recorded.