I also saw some house-hackers use two separate systems of heating (baseboard heaters in the dwelling unit, and forced air in the main unit). 

I think the biggest risk for most house hackers is waiting too long - so don't be afraid to pull the trigger once you feel you're educated enough on the topic.

You can expand your buyer pool for exit with 4 families as more people will be able to qualify for loans, and you may also be able to sell to retail buyer or house hacker who will likely be willing to pay higher prices.Just a thought.

I'm a 2x house hacker and out of state investor and recently completed my first out of state BRRRR.There is a lot to learn and happy to share my experiences.

Very smart of you @Nick RichardsThe VA loan is the most powerful loan on the market to house hackers.

I was curious if anyone has either (a) a good tax resource for house hackers and/or (b) a good recommendation for an accountant familiar with Short Term Renting and house hacking. 

I help house hackers all the time and I'd love to connect sometime so we can discuss your goals and I could provide some insight!

That would be a great opportunity for house hackers.

Sb9 requires 3 years occupancy which will eliminate it as an option for non house hackers.  

I'm a former 4-unit house hacker here and a CPA.