My guess would be that she is mentally unstable, not uncommon for S8, so be prepared.

If you say you are self employed that is a big red flag to a landlord due to fear of unstable income .

I don't think the site is generally more costly than the structure build until you start getting into unstable soils, steep hillsides or other things of that nature. 

Meaning you go and get a judgment but the tenant has an unstable job, cash under the table, contractor etc.You can obtain a judgment but the ability to collect is the key.

You don’t have to make a payment due to the property being unstable for 12 months or so with a bridge loan ??

IMO it would be better to sit on the sidelines during this unstable time and save some cash.

I have found a majority do not want to keep actively land lording, keep assets in a potentially unstable political climate, and only access up to 75% of the properties value versus 100% for a 1031 exchange and go passive.Within NNN there are many structures for leases, price points, rent increases with timing etc.    

If it is your primary, I might be a little more cautions, and do what others have suggested (especially if this guy is unstable).

From the bottom to the top the wall is about 15-20 ft with another smaller wall above that that goes to the top of the original hill thats terraced and set further back than the lower wall.My thoughts are that given that its a rock wall as opposed to dirt, erosion/mudslides etc arent as much a concern, however im not sure the likelihood of the rock its being unstable and possibly crumbling over time.Any input, advice, or warning are appreciated.Thanks 

From your post, it doesn't sound like you're really ready to get into real estate investing - no cash reserves and (what appears to be) unstable employment.