Instead of zip code comps, consider using comps that are limited to Canyon Crest. Even better, use Canyon Crest homes that are similar in age and size. Zip codes are a meaningless for tcomps because houses vary wildly in size, age, and neighborhoods within a zip code.
But you asked about the 92504 zip code ... so here goes.
There were 115 sales in the last 90 days in the 92504 zip code. These 115 listed at an average of $271,426 and sold for an average of $266,829. The average size was 1,593 feet. That means ana verage of about $168/sq. ft.
If you need more details, or want me to run the comps for Canyon Crest or your specific house, feel free to contact me directly at 951-571-9229 or Sean.Giorgianni@gmail.com