All the best,
Coldwell Banker Star Realty
BRE Lic #01456982
Look at this blog it will help you to learn more about your situation.
I've got most of my answers there as well.
You need to ask your realtor a print out of at least 3 sold properties within 6 months, I believe, that are comparable to your property. If you want, you can stop by at my office to pick up a copy.
Century 21 My Real Estate
7834 Florence Avenue
Downey, CA 90240
My Cell: 562-276-8681
Daniel is correct, your real estate agent should be able help you with this. If you do not have a Realtor you are currently working with & need help pulling up some comparable properties to yours, I would be happy to help you out. Send me an email to email@example.com with your property address, and I see what I can find for you on the Multiple Listing Service of properties that have sold in that time frame similar to yours as far as location, size & amenities & email you the information. Thanks, have a good day!
Coldwell Banker Residential Brokerage
Twitter: @RealtorJB Barry