BP family- I bought a duplex with an attached ADU in a great part of San Francisco (lower pac heights, 94115) about a year ago.

What would be the best loan option for purchasing another property under my name that I’ll be moving into as my new primary residence? 

Transportation options are plentiful.

Hi Jerrell,  The best option for trying to get a HELOC on a property would be to check with local credit unions. 

Quote from @Dennis McNeely: In a sandwich lease option, the investor exercises their option with the property owner to purchase the property when the tenant-buyer indicates they're ready to exercise their option and purchases the property.

Hi Kwanza,Bay Tek (650-204-1512) would be a great starting point, but I’d also recommend reaching out to Adler Builders (650-398-9030) and Mission Home Remodeling (415-855-7269) for comparable bids.In San Francisco, you’ll need a licensed General Contractor (GC) to pull the necessary permits.

Any tips anyone can share on how to find a reputable and trust-worthy contractor and/or a lawyer who can write up less riskier work contracts?

What would be my best approach, I assume find a private lender and work out some deal with them.All questions and answers will help thank you. private lender would be one option - also can you get traditional financing from a bank? 

If you are having trouble finding a duplex, is house hacking an option?

I've seen estimates of $200 to $400 per square foot for SoCal with $700 sq ft for something higher end and building up a hill and but possibly higher for San Francisco Bay Area (lhigher labor costs, etc.).