Most market reports you will find for the West Valley do one of two things: they average an entire city or zip code, or they show you the last twelve months. Neither helps you price a Sun City West patio home or decide between Sun City Grand and PebbleCreek, because active adult communities behave differently from the general resale market and differently from each other. They have their own buyer pool, their own seasonality, their own age rules, and their own inventory of floor plans that repeat by the hundreds.
Ten years of monthly history, held separately for each community, is what makes those differences visible. You can see which communities recovered fastest, which hold value through slow seasons, where inventory turns over quickly, and how the gap between two neighboring communities has widened or closed over time. That is context a single average cannot produce, and it is the reason we keep this data ourselves rather than pointing you at a national portal estimate.