If you have concerns about the terms of the addendum I recommend contacting a real estate attorney in your locality.

Especially if people are asking for proof of funds.I think I am most concerned about finding a deal and getting it under contract and then that time in between obtaining the contract and finding a motivated buyer.Nate

We've had some maintenance concerns, but overall things have gone well, this year!

One of my worries is the trees by the house causing foundational issues.

It will attract better tenant/buyers who are more likely to close, and less likely to cause damage.I don't do rehabs myself but I focus almost exclusively on doing lease options with nicer homes for exactly this reason.

I am not a lawyer, nor is this legal advice, but I would think this could cause you problems with fair housing laws.

When trying to grow, cash flow isn't your concern. 

My concern is if you don't know the lease goes with the property, what other important legal details are you missing.

I have my property manager dealing with him and going over my concerns and I'm supposed to hear something back today.

There isn't anything structurally wrong with them where I'm concerned about the foundation.