You can get comparable sales information from records at the county assessor’s office, realtors, or title companies. You should use property sales that are most comparable to your property and which are sold closest to the assessment or appraisal of your property. The best comparisons are those where you have data on both properties side by side: for each sale comparison, make sure to include the parcel number (if applicable), date of the sale price, as well as any other factors important in making an accurate determination such as square footage and lot size; always be mindful not only about comparables but also differences between them when comparing values!