Prices have surprisingly dropped but pretty much bottomed out in that area, mostly because people that Live in the sunnyside area do for most of their lives. This area is one where people move the least, until recent years when many chose to cash out and retire elsewhere.
When I first moved to Sunnyside, the previous people who lived there moved to Florida to retire and shortly after so did my neighbors which coincidentally was his brother and his wife. Sunnyside is changing but not drastically enough that I'd worry, it's still without a doubt the most desirable area of town.
If you'd like help making the offer or seeing the house I'd be glad to help, I know the area inside out.