BiggerPockets

Dexter,

Do you have a recent appraisal or broker price opinion?

Dexter,
County tax records are not accurate for property valuation. You will need to provide comps and actual sales data.

If you have to ask that question, I'd recommend finding a good agent that knows the local market and ask for a CMA or BPO. That should provide the comps you need...

Dexter,
You can get an actual appraisal for about 300 bucks.
If you choose to comp yourself, you should not go back more than 6 months or should not go further than half of a mile away. Make sure to consider amount of beds and baths, foundation type, garage, sq ft, etc...
If the property is on a main street vs. a side street, the value will take a hit.
In short, a local realtor can get you a BPO (brokers price opinion) for about 75 bucks.
I would be very cautious of zillow and sites like that for accuracy.

Finally, If you are going to borrow, you will have a much easier time if you have some skin in the game. So make sure you offer to have 10% or so into the deal and be at no more than 50% LTV to give a nice security.
Good luck!!!