What if the primary applicant moves out with no notice?

The two existing LTR units (on my family’s property) were built 5–8 years ago at a cost of about $80,000 per unit, so I’m estimating a 20% increase in costs for the new builds.My plan is to use the equity in the land as the down payment for the construction loan, which I expect will make closing costs the primary upfront expense.

That home was in Milpitas CA.. probably worth about 1 mil today.. but I lived there 2 years sold it made over 50k and I was off to the races.. primary home equity as I look back 50 years of ownership and multiple homes has made me well over 2.5 million in tax free gains. 

All the tax deferral of the 1031 and still using it to purchase your next primary residence as well.

If no one but owner-occupants can STR... then that should mean opportunity for owner-occupants who STR their primary residences in many jurisdictions.- Large remodels or construction projects (Live in Flip) can be self-managed, worked on directly, and the value add, after 2 years, is largely tax free up to certain limits. - Many areas around the country allow for ADU Construction - house-hackers enjoy similar benefits to remodeling projects by being naturally on-site for ADU construction. 

She will get you set up with a consultation.They specialize in High-Level Tax Strategy, using real estate as the primary vehicle. 

From their point of view they're seeking three primary things:Access to capitalControl of their dealCost of capitalThey likely have a lot of the first two so the only motivation they'd have to accept your money into their deal is either the third bullet. 

The primary issue is that building small unit in a single count is some of the most expensive development.In addition, in most jurisdictions the primary unit will become rent controlled (assuming more than 15 years old).  

When I return to the country after my Au Pair contract ends, I hope to live in the property as my primary residence and house-hack as well.I understand that investing remotely makes things more challenging, but I am also ready to be uncomfortable and challenge myself in this journey as I know it is 100% possible.

One of the best hacks if you have limited cash is to buy a primary residence with up to 4 units.