I tried to just list the web address that references the below quotes, but I cannot. So, at Agents Online Real Estate Idea Center there was a discussion just this past June about abandoned property left by tenants in California. Below are the answers to a question similar to yours... but about renters. So, this may not be exactly the answer you need to go with, but it should, at least, get you started in the right direction to find the exact answer. Hope it helps.
Shaan: "You have to do a personal property eviction for 18 days. You have to post a note at the house & send a letter to the address to see if it gets forwarded. You either store it or leave it at the house. After that time you can sell it or do whatever with it. If it is under what you could sell it for at a garage sale for $300, you can get rid of it now. But its better to be safe than sorry!!"
relady4u: "Check with the eviction attorney for the 18 day letter. Post it to the door and sent it certified mail. If you have to sell the property, the tenant can actually purchase it at the sale. After the 18 days you don't actually have to store it. If it is under $300, have it trashed out. Just make sure you CYA!"