Investing in real estate can provide a much better and safer investment than precious metals.

Spells out material terms and assumptions.

I would ask to see any of the lease materials so you know all of your obligations and the rent you should be collecting and for how long. 

Terry Wright with Coldwell Banker teaches a really good class with exam prep materials.

I did a ton of research on different areas near where I am working and after looking at many many properties I came across one that met all of my marks.

I would consider that a material fact if the intention was clear that you were going to maintain this as a rental property, however if you do legal battle with them I don't know how much you'd realistically get.

As far as following up with the owners would you recommend to go and talk to them directly or regularly send them flyers and marketing materials (recently sold brochures, market reports etc...) to keep in touch with them? 

In their marketing material, they refer to the “guaranteed rent” program as “Immediate cash flow”.

When I'm home on the weekend, I'll look through my materials to see if the links, etc are still valid and see what I can post here.

The typica test includes a magnometer (super duper metal detector) as well as looking for signs of a tank (vent or fill pipes, cemented over holes in the foundation wall where the lines came in, etc).