Well, I have to contact the seller to see if those details are correct.  

I've been working on getting 34 acres for a week or so now, pieces are starting to fall into place, other pieces are showing more detail.

Did you get a tenant estoppel form that detailed the security deposit rent etc. when you purchased?

He should talk to his attorney to find out the details.

All those research items you mentioned won't tell you that...because the resulting "numbers" you compile, won't end up meaning the same thing in every area. 

Also, confirm who handles the HOA-related items, it's not uncommon for PM's to not provide this service and it falling back unexpectedly on the owners.

They are not required to do this and you are not required to do it unless they want toOnce they surrender the property you have 21 days in which to charge back damages and send a itemized letter of charges and any refund minus deductions. 

There are other ways to increase your rent payments by on-site amenities, it's accessibility on it's frontage/or primary road, it's location that is close to a good accessibility to many businesses, and the parking that they get or have to use.' or any other value-add item. 

@Patrick Hall these items are part of your market knowledge that you will need to acquire.

This post right here might be the most detailed I've ever talked about it in fact ;) as for timelines: if you want to get a great deal, I recommend moving very quickly.