Hellobee Boards

I don't really have a good answer for you, but I suspect that if you feel uneasy about not being able to see your kids in the side yard, you'll just have them play where you can see them. Maybe some patio type activities like sidewalk chalk, cars, water table, etc.

Ours is like that. You can't see anything from the kitchen, but you can see the front (not fenced in) yard from the living room. I'm not too concerned. While they're younger I wouldn't leave them outside alone anyway. When they're old enough to go outside alone, I think I'll be okay not having my eye on them constantly.

I agree with @Weagle! Ours is like that too - the biggest part of our yard is more to the side and you can't see it from anywhere - there's only one window on that side of the house too! And it's not fenced in. When they are young and playing outside, I'll just be out there with them, probably in an Adirondack chair with a good book, haha. And when they are old enough to not need constant supervision, I'll be okay with just having to go outside to peak at them on occasion. Or more likely yell "WHAT ARE YOU DOING OUT THERE???"

We just bought a house on a corner lot, it has fenced in pool to the left and the street to the right. We put up a fence and added a gate to the deck so our son can go outside.

My kids are never in the yard by themselves, even though it is fully fenced and I can see a huge chunk of my yard. DD is three years old, and I would feel really uncomfortable with her in the yard by herself, this wouldn't be a deal breaker for me. I don't know when I would feel comfortable with her out in the yard by herself, five maybe?
So, if the house is perfect in every other way, I say go for it!

We have a pool, so the girls will never be able to go out by themselves anyway!

This would not be a deal-breaker for us. You can't see our backyard from our kitchen and you can see a little bit of it from our family room, but there's some you can't see. I think as long as it's fenced and there isn't a pool then it wouldn't be a deal-breaker. If there was a pool and I couldn't see then that would probably worry me much more.