The main issue that you'll run into with what you've proposed is that you cannot legally rent out 4 rooms separately in Philadelphia.

Then the investor assigns the agreement to a tenant buyer with the approval of the seller and the tenant buyer assumes the rights and obligations in the lease option agreement and the investor collects the assignment fee and moves on.How would a real estate agent assist the investor in this process?

This is not legal advice- btw.

You may put in a ton of money and work just to find out that she has no legal claim over the property.If I were you I would keep in touch with her and get her through probate. 

I think were legal and within the scope of the law and NOT selling them today for more than they are worth.. is fine..your buyers if they are paying more than they are worth are not going to get financed once they get their appraisal.. and or in 2022 if the market has gone up its moot anyway you might really have sold for too cheap.. 

Let them know you are not able to approve their application because they were not truthful on their application about the number of dogs.

My wife and I received our pre-approval letter last Friday.

My wife and I received our pre-approval letter last Friday.

Do we need your approval before posting anything that's not a vague reference to your creative secrets? 

Is there any legal issue I would run into if I only kept scanned copies of leases electronically, or better yet, only had completely electronically generated and signed documents like real estate agents use?