1. I would always get a survey on acreage next to vacant acreage to easy to misunderstand the boundaries.
2. Buying a lot between houses is always a good deal if you buy it right.. Manny in our Gold group just did the same and I suggested he approach the neighbors. they probably have wanted the property for years.
3. Property zones dont matter if your only concern is buying under market and then sell.
These are good Streamyard questions too.