There is likely a phone number and persons name that will come up, that you can reference, since he is having bills that arrive to the mailbox and packages to the door with his name on them.You could make it a pre-condition to the seller that he allow a background check on the tenant before closing and your offer is contingent on your approval.Neighbors typically know what's going on in the neighborhood and will know who the guy is and if he is a trouble maker.He probably has a car and a private detective can run the plates.And so on.The information is readily available is the knowledge is worth knowing.

We are sandwiched between well known hot spots and its an ideal location for someone who wants to explore the beach life or any of the down-town areas nearby (Los Angeles, Long Beach, Redondo, Manhattan, Southbay Etc), new build with modern amenities, washer/dryer in unit, full sized fridge, dishwasher, professional range cooktop, queen bedroom, full standing shower, large kitchen, full sized couch in the living room, private front patio. 

Private financing How did you add value to the deal?

I would guess many private party deals between people who know each other well may not bother with deposits.

I really appreciate and may contact you in private.

I highlighted some below to help you make your decision.

I could go on for days, but that's just a highlight of a few places to put on your radar. 

It's mild insanity and recipe of long-term failure.If I counted up the amount of times I could have told an investor I told you so because I gave them sound advice and watched them not follow it and lose money, I could fly to the moon private.

I do commercial real estate lending, but mainly bank alternative programs and private money.

I recommend you print, study, and highlight the HUD guide: https://www.hud.gov/sites/dfiles/PA/documents/HUDAsstAnimalN...You should also check with a local HUD office to see if they have any additional guidance they can provide you.Keep in mind, not everyone is subject to Fair Housing requirements and you may be exempt from allowing the ESA!