Area, tenant use, tenant credit (i.e. only Moody's BBB or better guarantor credit).There are a lot that can vary in NNN, just like any other real estate.You have market risks: FL has another hurricane coming, CA has earthquakes and wild fires, the midwest has anemic population growth.You have some location risk: is building on hard corner with signalized access or buried mid-block with no turn lane?  

I've seen people on FB advertise cold calling services which seems interesting.

We do not do Syndications; we have access to all the funding we will ever need, and I don't like sharing the profits. 

I'm biased and can provide reasons and data to show that using an agent will protect you, get you more money, less stress and so on.The reality is you can do it yourself, but tenants generally don't cooperate with showings and that causes lots of problems for buyer to access the unit to show, inspections, appraisals etc.

The property has about a quarter mile of street access, and no trees or anything to block it, so I wanted to put something there to give a little privacy anyway, and then these trees obviously have to go, so I was hoping to re-use them.

Do you advertise and show properties BEFORE a tenant moves out?

You just advertise that free pool/landscaping is included. 

These will allow you to advertise in an area where viewers are actually looking for a new home or apartment.2) boost your listing with a small daily budget.

Easy and low cost.Simple for folks to access.

Otherwise, as others have said you’re basically advertising you don’t plan to close.