The best place to get this answer and help you best negociate is to be represented by a local Accredited Buyers Representative ABR. If I can help you please feel free to contact me.
Now, to answer your question: Last sale price was $470,000 bought in 2005 putting it very close to the current asking price. Good news is, according to the public assessors data, they financed only $63,000 so unless they refinanced at some point the current owner shouldn't be anywhere near short sale territory - good news for your negotiations. you can find sold data online in the public records.