On the surface, it seems like such a simple creature – but there can be A LOT of potential problems lurking beneath the surface of any piece of land. I wouldn't necessarily say all these issues are common, but the fact is – any one of these things could potentially be a deal killer if not addressed properly. When you take it all into consideration, it adds up to a sizable list of things that ought to be investigated as part of your due diligence process.
I would appreciate your opinion about my situation. When I purchased my home on 5 acres twelve years ago, the builder included two acres at no additional charge. Both the 2 acre and 5 acre parcels are adjacent to each other. So, I have two properties with two tax bills. In the future, I plan to obtain a reverse mortgage, so I would like to maximize the value of my home by combining both parcels into one larger 7 acre parcel.
One of the best ways to do this is by using Google Earth (which is free) and the topography map from Earth Point (which is also free). With Google Earth, you can search for your property (using the address or coordinates) and zoom in using your mouse buttons and the control/command and shift keys on your keyboard. This will allow you to tilt the earth so you can see precisely where all the hills and valleys are in your area.
This question is out of my realm...but I'm curious why you decided that the current developer is not interested in your property? If his equipment is close... it might not be that hard to deal with your property. Since you already have a house on it, I can assume there's sewage, water, electricity, etc... So your land doesn't need to really be developed, but they could build something nice on it.
Your buyer profile can depend on what type of property you are selling, whether the land has been developed already, its location and market conditions, among other criteria. Is your likely buyer an individual looking for a lot for a new home? Or is your buyer going to be a builder or developer looking for land for their next project? Or is your buyer some combination of those, or someone different altogether? There may be different buyers for finished lots, rural acreage or a parcel of suburban land in a thriving new home market.