Hi HI, the answer to your question depends on what criteria you look at, and the further you dive into details the more accurate your answer will be.
Since it looks like you may be researching a new purchase, rather than a wide-sweeping approach to the information you seek consider having a Realtor perform a Comparative Market Analysis (CMA), which is the "gold standard" for determining pricing trends based on a targeted search criteria (beds/baths/SF, etc.). A CMA always provides the best representation of market price/activity/trend direction - for the specific property details you search on (and it shows the details you are looking for).
You may also find this 2Y history for Union City useful as well (Detached single family homes (no condo/TH), 3 bed, 2 bath, min SF of 1200): http://docs.Steven-Anthony.com/UnionCity2yrSFR3-2-1200.pdf
This will list: a) Median Sold Price, b) Sold Properties, c) For Sale Properties, d) Under Contract Properties, e) New Properties Listed, f) Supply/Demand, g) Average Days on Market, h) Months Supply of Inventory.
I need to make a comment regarding the first chart you will see, the Median Sold Price chart. I typically advise Buyers to NOT use Median price reports for making purchase decisions due to the fact a â€œmedianâ€ is defined as â€œthe number separating the higher half of a sample from the lower half.â€ Most Median reports are of questionable usefulness because the sample data it too wide, which can be skewed by segments of market activity not matching your individual â€œtarget home.â€ For example, Iâ€™m sure you can appreciate the difference in data quality between an â€œall home sales in Union Cityâ€ versus â€œall single family home sales in Union City." The more detailed your criteria, the more meaningful it will be.