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.
In terms of an investment – I only buy land when I’m getting it for FAR below market value (which basically guarantees that I’ll be able to sell it some day for more than I paid for it)… and it doesn’t sound like that’s necessarily what’s happening here. If you think you’d be able to use it for something that would increase the overall value of your current property, then it may make sense… but if not, then it may not make the most sense from an investment standpoint.
Land Requires Different Sales Techniques – A home has a kitchen, bathrooms and a façade that can be visual and photogenic. You can hold an Open House for a home and walk a buyer through each room to help make the sale. Buyers can easily visualize themselves in – and fall in love with – the built home. It’s just not the same for vacant residential lots and land.