I have purchased a few parcels of undeveloped land in New Mexico. However, never with bank financing so I'm not sure how helpful I can be.
If bank financing seems difficult to obtain for whatever reason, owner financing may be worth pursuing. I would avoid anything similar to what in New Mexico is called a 'real estate contract' where you pay a fixed amount each month but lose all of your interest if you miss a payment.
The main things to consider with land purchases are probably known to you: Insurable title, legal access, easements, mineral rights (often with oil and gas differentiated from other minerals) and access to utilities including water rights if you will eventually need them. Most of this will show up on your title insurance binder (as exceptions). In any purchase agreement, make sure you give yourself an out if something doesn't meet your satisfaction on the binder.
All of the land I've purchased was essentially agricultural land. Obviously, if you are buying with an eye towards future development, you would need to consider more such as flood zones and any zoning. You are welcome to PM is you would like.
David.
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-- David.