I posted a similar deal almost a year ago.

http://piggington.com/landlords_who_try_to_sneak_a_home_sale_past_tenants

It appears that they successfully sold (not arms length, though) and now it’s relisted without tenants.

http://www.redfin.com/CA/San-Diego/3776-Centre-St-92103/home/5370327

If you mail it, you’ll avoid the mail tampering problems mentioned in the thread I linked. Not sure if it gets you past the “tortious interference w/business or contractual relations” that is mentioned in the thread.