First answer is get an agent to help you evaluate your potential purchase. It is not that difficult and every agent should give this information free. Find an agent that fits you and make contact, my contact information is on my website.
In order to come up with a fair selling price you are going to look at everything that has sold in the last couple of months. You will want to pay special attention to those proeprties that most closely match your subject property. Ideally these will be built in similar styles, square footage, year, amnenities, location, etc.
Ideally you would want three comparable sold properties and three comparable active listings to compare against your subject property. It sounds like you may be having difficulty coming up with comparable town homes in the Woodpark area.
If that's the case you will want to look back a few more months until you do find the most comparable sold, there should be one at some point. Then decide what the pricing trend in that area was, did property values rise or decline.
Compare SFR and new construction as a last resort.
If you're not working with a Realtor find one that you trust and ask them to help you find some solid comparables.
Commmunity Relocation Representative, Buyer's Agent
California Relocation Network