We declined, and asked Tenant to confirm the 3 months extension with existing rate and terms.

Just waiting on confirmation of a few more things. 

In addition, alternatively to hiring a property manager, look at some software that takes a lot of headache out of the job.

But compared to other online softwares the BP calculator is probably one of the best.

At that point I become the second set of eyes instead of the sales person who tells them this is a good deal (the last thing I want to be), maybe run a formal CMA, so we have the data to confirm what we both think.

-Profit n Loss - Year to date Profit n' Loss signed by a CPA. ( needs to match bank statements ) -CPA letter confirming that borrower is self-employed and the business is profitable and legit .

I would like to get input from anyone that's actually closed on an interest free seller financing deal or someone who knows about the topic who can confirm if this can in fact be done. 

Looking for software to help streamline my property management business.

This is how I would handle each of these:Insurance: I would use Zillow's number for stage one and then you can confirm with an insurance agent once you are under contract in due diligence. 

PMs are an unnecessary expense. good software and automation can replace almost of what you do. good cleaner/handyman and you on the phone can handle the rest.