It can be tough but that is what makes this forum so helpful you have seasoned pro's to help.If you ever have specific questions feel free to reach out I enjoy helping and talking REI.

Do you still use a regular purchase and sale agreement with the original seller with any included addendums specifically for wholesaling, and are you legally required to verbally disclose to the seller and buyer or do these disclosures just have to be in the contract itself?

The same holds true for investment properties as they do any loan, with regard to when you closing and not having to making a payment for a specific period of time.

Did they deny this as an "Act of God", or were landslides specifically denied in the wording of the policy?

Depends on your local rules and regulations, but in the state of Virginia such a practice is perfectly lawful.PS: Do not take model legal language and incorporate it into your contract unless such language comes from an attorney. 

We'd need some property details to be specific about rate and term.

I am going to focus on specific actions we took that brought forth critical information during the due diligence period. 

Perhaps you could be more specific with what you seek. 

Investment Info:Industrial industrial investment investment.

It really comes down to what specific documents you need from the tenant that you'll feel secured and comfortable of renting it to him/her.The typical criteria would be credit, background check, renters insurance, first + last month of rent + security deposit.