I'd recommend using the networking tools here on BiggerPockets! 

A CPA should confirm this, but my understanding is if it was closed and vacant, and not 'in service' at the time of purchase, it was essentially acquired for the land value.

What's a good way to test the accuracy of tools like the BP rent estimator and others?

I was lucky enough to have a family member sponsor this purchase essentially.

Make sure you check out all that this site has to offer.The site has quite a few tools that can be helpful for new members.

Then, in a couple years I could replace the roof at my discretion.On the flip side, if the appraisal does get revised, I could continue as originally negotiated essentially rolling a new roof into the low rate 30 year mortgage loan.The more I consider it the more the lower closing price and payment sounds desirable with the exception of needing a new roof literally hanging over my head.What would you do?

Then it’s just up to majority vote essentially.

@Elijah Crew, leverage is a powerful tool.  

Essentially, you're looking for capital for deals.

There are some great study tools that can help you retain the material, but you do need to make a commitment and put in the effort to prepare.