A large piece of undeveloped land may get you the greatest return if you subdivide it and sell each parcel separately. Have the land surveyed to determine which parcels are suitable for home building, which have other uses and which are likely to remain undeveloped. Keep one or more parcels for yourself if you still want an investment stake in the land, in case its value rises in the future.
This is one of many reasons why people buy title insurance when they purchase a property, because it ensures that the title is clear and that the buyer is actually getting all of the rights they’re expecting to get (unless otherwise noted in the title insurance commitment). If you’re concerned about this and you haven’t already ordered a title commitment, you might want to consider doing this.