Tony,
You might want to send your neighbor on vacation for the winter. Unless that thing burns with absolutely no smoke your going to have a problem. I hate to be the bearer of bad news, but the houses in your neighborhood are far too close together for an outdoor wood furnace. Being that close, your chimney height should be at least the height of the downwind neighbors roof. I have an OWB and love it, but I live on 4 acres, and quite honestly even that in my opinion is pushing the limits of being too close to the neighbors, and I only burn seasoned wood in it. My recommendation is to either put one heck of a chimney on that thing, or don't buy it.