The following was a writeup done on this - or another forum some time ago about subject to ownership and insurance. Thought it might provide food for thought.
The proper way to insure the property, once you (or your entity) own it, is to have a non-owner occupied " landlord" policy, with you as the new first named insured. The bank/mortgage company is named, as normal, as mortgagee. The prior owner should be named as the additional insured ONLY. Naming the prior owner as additional insured will usually keep the mortgage company happy.
But, you may ask, why not keep the ex-owners policy in place? One concern of carrying 2 policies on the same property is that most policies have " excess" clauses. In other words, the policy will pay only excess amounts, if any other policy exists. If each of the 2 policies have such a clause it will create havoc in getting a loss paid...
To further clarify the scenario here is a hypothetical example:
Property has a " homeowner" and a " landlord" policy (both) on it. Fire occurs. Owner files a claim under the landlord policy. So far, so good. However, " tenant" (prior owner, or new occupant), has personal property damage. He must also file claim, but against his " homeowners" or tenants policy. The respective insurance company on each claim is bound to find out of the other policy's existence and could (more than likely would) attempt to invoke the " excess" clause of it's own contract, potentially leaving the owner waiting for courts/arbitration to settle... I wouldn't take the chance with 2 policies. If an insurer has an opportunity to mitigate, or deny, a loss if there are contractual issues, be sure they'll try!
(As an added note, if the prior owner moves out, the " homeowners" policy is no longer valid as the property is now " non-owner-occupied" ).
Bottom line: if you own it, you insure it. If the fact that a DOS clause is/would be invoked if the insurance policy changes, I would walk away before potentially diminishing or even sacrificing coverage by trying to " skirt" the correct way to insure the property. In 12 years, we have yet to have a loan called (knock wood) by insuring the new owner on a " landlord" policy and naming the bank (and the old owner) as mortgagee and additional insured respectively.