So they *have* to have the reserves setup in advance.

Our primary residence is currently inhabitable due to hail damage.

I don't have income verification or returns available and my Fico Mortgages 5, 4 and 2 scores are 616, 560 and 621 at Equifax, Transunon and Experian respectively.I have up to 180K cash for a down and $50k in additional reserves.

Investment Info:Single-family residence buy & hold investment.

If you are a newbie I would go conservative at least 6 months of reserves.

Rent out your current residence.

Sounds like in your situation a cash out refinance would be the better option since it is less risk and you can get a lower payment/rate verus a heloc.There is a lot of issues than can arise with a Heloc which is the same as a credit card verus liquid reserves tax free cash in hand that can be used as an asset for PITI reserves or collateral in general for compensating factors in underwriting or rate/term qualifications.I enjoy helping other BP members save more time and money I say it a lot here on the BP forum but its super helpful to avoid mistkes and lost deals as well.  

I then reviewed their booking calendars, paying close attention to how often they were booked, the length of stays, and the gaps between reservations.

My partner and I are looking to purchase a residence a TIC for a two story unit in San Francisco.

I've bought house hacks with less than that but that still leaves you with little to no reserves.