Make sure you know the value the ADU will add to the property before building the ADU. 2) the financing on an ADU is typically far worse than for initial investment property acquisition or is often not leveraged (HELOC, cash out refi, etc).

I am struggling to find the right option for a HELOC on my second home in Northern Michigan.

If you add value or buy at a decent price then you can get a heloc down the road as well @Arianna Farinas

You may want to consider a HELOC - If you want to flip or BRRRR.

I need a HELOC so that I only use when I need it. 

Not all lenders offer HELOCs on investment property but you can find the ones that do by calling around.

I don’t believe a HELOC is applicable since it’s not my primary.Maybe a DSCR (debt service coverage ratio) loan?

I didn't use a wholesaler and these are long term rentals.I could theoretically do cash out refi on Bay Area SFH or take a HELOC against my primary and both have a good amount of equity but that's too risky.

We currently have around 175K in equity in our house we are willing to access some of it utilizing a HELOC but we want to get connected with investors that can help us walk through this! 

There's < 2 months of seasoning for the purchase, cash into the deal is ~$975k w/o rehab (minimal planned so far - turnkey), purchased the property for 35-40% below assessed value, 825+ FICO, and would optimally like to pull out $975K-$1.15M of equity.Main scenarios we've thought of to accomplish this are: 1) structure sale of property from SMLLC to self and secure 30-year new purchase financing on deal (unsure if legal and tax implications if above initial cost basis)2) delayed financing (LTV restrictions a concern)3) cash out refi (seasoning concerns)4) DSCR (seasoning and rate competitiveness concerns)5) one of the above plus a HELOC, personal loan, etc.?