Again, a grocery store may be easily converted into a retail department store type thing, but a grocery store going into a building that simply has open space can be very costly due to plumbing and food storage equipment.

So, I'd suggest, when you're actually willing to work and get off you fat back sides, to get your tail out from behind a computer screen, off the couch and get some decent shoes on and walk and talk, Learn how to meet people face to face, knock doors, strike up a conversation at the café about what you do.

You're also in the shoes of a lender buying institutional notes, if you have your eye on getting the collateral you need to consider laws of equity, all you're entitled to is the UPB and costs of collection and it depends on the deed given as to your obligation to dispose of property after foreclosure.

Their family is growing and they want more storage.

She keeps the place very clean, she insists that people take their shoes off when they enter the place. 

Below are what I consider conservative rent #'s, I feel I may be able to get an extra $100/month income via rent and storage units and I also feel the home will appraise enough for me to pull all my cash out but include a worst case scenario of putting 25% of my total investment down.

Her husband was gone to get a UHaul and storage set up so I'm going to stake the area out for a bit and see if a UHaul pulls up.

I leased out apartments, mowed lawns and trimmed palm trees (and got stung by many bees), did exterior and interior painting, took on property management contracts for friends, managed my older friend's 16 properties, managed my parents' 55-unit storage facility, worked most Friday and Saturday nights and got my Real Estate License and have done around 10 deals.  

Any advice from anyone who has been in my shoes?  

Negotiate the longest term for your "purchase money carry back mortgage" and remember that there's a high chance of further opportunity to discount that note should the seller push for their money early and you choose to refinance.Alternatively, If you buy the Daughter's inheritance, called an assignment, you step into her shoes and must satisfy other creditors as well as the legal cost of probate, however you'd have maximum control over the outcome since you could theoretically choose who is appointed administrator and selection of the attorney.