The fact that you need to ask that question shows why you need a Realtor to help you with your transaction. If you just want value, then hire an appraiser. I don't think that a Realtor would want to guess at the value of a home they have not seen and don't have an address. There are too many unkowns. I know that neighborhood and I know the home is not on the corner of Vermont & Redondo Beach Blvd.
You state that you are purchasing this home. Who came up with the price? How much negotiating did you do? What were the terms of the contract? Who are you using for your appraisal, home inspection, etc.? Who reviewed the contract, disclosures and other documents for you?
Like hiring a good accountant or lawyer, having the right real estate agent could save you plenty.