If they don't qualify for a loan due to bad credit or lack of a down payment when they start renting the house, they will have a hard time saving up the necessary money and repairing their credit in the 2-3 years during an option period. 

I have 11 months left on my rental agreement and I’ll need that time to save for my first purchase, would it be a bad idea to see how much I qualify for now or should I wait?

I hope thats not what the bad people are going to start doing taking a real BP members name and then just put a letter after it.

If she wants to give money as a gift that’s fine, just do it below the gift exclusion for tax purposes, but taking a loan is probably a bad idea

Having a shared wall is much better than having a shared ceiling/floor.As to the building's age, 100 years old is not immediately a bad sign because people update properties as they hold onto them throughout the years.

Most people do not complete their contract, which isn't always bad. 

And I understand the negative impact a bad or negative team member can have, be it a realtor, contractor, accountant, lawyer, etc.  

Bad stuff happens to good people, but some of them just want to "stick it to the wealthy landlord".     

Although banking on equity is a bad strategy, I would hate to see you have no equity and no cash flow one day. 

That's bad luck.