If so, is there any red flags such as rental restrictions, limitations, etc.

I have never pulled a permit for a water heater swap, know no one that has ever pulled a permit for a water heater swap, ever seen or heard about one getting red tagged for no permit, and have never had a plumber recommend getting a permit.

You can't rent out a PO box and live there.And yea that sounds like a huge red flag to me. 

I contacted as many companies as possible to get a quote to compare prices for new gas furnaces. I am looking for pricing information from the BP community on how much should I expect to pay for replacement and instal...

Red flag. 

After 20+ years in real estate partnerships, here's what actually puts you on the IRS radar (and what doesn't):REAL Red Flags That Matter:The Partner Complaint TriggerDisgruntled partner files Form 8082K-1 disputesPartnership disputes leading to tax filingsReal Impact: Instant IRS attentionSuspicious Loss ClaimsLosses exceeding investmentArtificial basis inflationSudden large losses without economic realityExample: $100K investment claiming $500K lossesRelated Party GamesCircular property flipsBelow-market transfersFamily partnership schemes without substanceWatch Out: IRC §267 and §707(b) violationsDebt Engineering Red FlagsBasis inflation schemesArtificial guarantee arrangementsPartner debt shifts near year-endCritical: IRC §752 compliance matters!

I was thinking this might work on my property in Redding and can be adapted to a shared housing project for seniors (though I'd want rooms large enough for bed, bath and seating area)  It's my understanding that it is considered a SFR with seperated bedrooms as far as planning.

Quote from @Joshua Alcantara: I’m looking to move out of the current "red ocean" of real estate wholesaling and focus on helping sellers with problematic titles, such as liens, divorce issues, probate, quitclaim deeds, etc.All my previous high-value assignment fees came from working with sellers who inherited properties without a proper deed.

The latest red flag is his belief he purchased a "fully renovated" property in Philadelphia for $115K.

I noticed that the previous owner let them pay half the security deposit and the other half later, which is a red flag.