I'm Doug, and my goal is to provide you with excellent service today. I have been a CA licensed attorney for more than 3 decades.
You can deal with this in one of two ways.
1. You can negotiate with the present tenant to leave shortly before the close of escrow on the sale, or
2. You can find a buyer who is willing to assume the lease on your behalf with the sale. This could be a buyer that wants the place for a rental investment, or someone who is willing to wait until next March to take possession but will collect rent in the meantime.
What you do not want to do is to sell to the buyer without their agreeing to assume the lease, or if you have not bought the lease out from the tenant, because if you do neither of those things, then the new owner will be able to evict the tenant and the tenant will in turn sue you for illegal eviction and Breach of Contract, and that would be very expensive for you.
You may reply to me again if you have additional questions, and I will be happy to continue to assist you.
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I wish you and yours well in 2017,