Under what typical circumstances would the California Board of Equalization (the sales tax people; I don't know what else they do) ask a landlord for detailed information about a retail business which is a tenant? The landlord has no dealings with the BOE, so this is clearly the BOE investigating the tenant for something.
They are asking for copies of leases, payment history, copies of rent checks, who made the payments, contact information, etc.
My guess is they are going after his failure to pay his sales tax returns, but I don't see the relevance (except in a very general way) of the requested information to this possibility.
This group has vast knowledge, so I thought I would ask.