@Daniel Fang ... @Account Closed hit the nail on the head. Do you research on how commercial real estate is valued by a lender. They will take the NOI (you need to know this term inside and out) and calculate the valuation based off of that. If you are living in one of the units, that is 1/6 of the rent NOT coming in, and with most other expenses steady, that is a huge valuation loss. You will then get less of a loan and ultimately sell for less since the valuation of sale price is also based off of NOI.
I do think you are doing the right thing by speaking with banks already. Most banks will value a 4 unit or less (1-4 doors) against comparable houses / buildings. Anything with 5+ doors most of the time will be valued off of NOI.
I think your best bet, if you want to house hack, would be to look for a 4 or less door building and try to get a personal FHA loan against it. That will require much less money down (dont need to sell all/most of your stocks) and will at least pay for your mortgage, if not cash flow monthly. If you do get a residential loan, however, keep in mind that most banks will not allow you to put it into an LLC (especially if they plan to sell it to Fanny Mae or Freddie Mac). It will have to be in your sole name, against your own credit. We did this with a couple SFH, and just increased our umbrella insurance coverage with our broker to about $2 million dollars with 2 incidents max per year. We feel comfortable with that protection outside of an LLC.
Hope this helps! I would strongly recommend finding a partner or mentor through this before taking the plunge on anything bigger than a duplex.