One thing I would highly recommend that I wish I knew was ask if the seller would be willing to give a credit for a sewer scope, and get a feel for how much they will give. 

I wish we could tap into equity as easy as that. let me know if I can help in any way but probably not to answer your question. if you can split the lot and sell half that might be an idea to recapitalize. that's the the only way 

Further, may be difficult to compel the tenant to comply with your wishes if you are currently in a MTM situation with them. 

Whatever you decide, you're in an awesome spot, and I wish you the best of luck! 

I wish there were a down-vote button for this idea.

Wishing you luck with your transaction.

Are there things you wish you did during the stage of your life that I am?

I agree with @Jonathan Greene in terms of having a specific buy box - size, condition, and type of properties you wish to focus on.

I wish the answer was you just screen them out but some of them are quite adept at hiding it.

But then they look back and wish they would have kept it because it would still be generating income for them.