Zillow estimates are based on a variety of factors, including recent sales data, property characteristics, and local market trends. However, there are several reasons why these estimates may not be entirely accurate. For example, Zillow may not have access to all of the most up-to-date information about a property, such as recent renovations or upgrades. Additionally, Zillow's estimates may not take into account unique features or characteristics of a property that could affect its value. Finally, local market conditions can change rapidly, and Zillow's estimates may not always reflect the most current trends. Overall, while Zillow estimates can be a useful starting point for understanding a property's value, they should be taken with a grain of salt and should not be relied upon as the sole source of information when making important real estate decisions.