Property Appraiser Website Question

[Adonis Yancey]

So I'm looking into a duplex that I'm interested in purchasing so therefore I check my county's appraisers site to get some information to help in my evaluation. I had a few questions about what I saw on the site concerning the property so I reach out to an agent from the appraisers office. The agent was able to tell me that the Total Market Value of the property was $200,930 for the 2021 Tax year. The breakdown is that the improvement value is $120,043 and the land value is $80,887 which adds up to $200,930. This information was also on the website. I asked the agent does it make sense to pay more than the Total Market Value that they have on the site. He said that he wont be surprised if the owner asks for 300k for the property. So my question to you guys is can the information on the property appraisers website concerning the Total Market Value be trusted and If so should I be willing to pay more than the amount that they have listed? If so how much more should I be willing to pay? Is there a range? If the Value is truly $200k I'm not sure that paying upwards to 300k would be a good idea but please help me understand. Thanks.