They've done great job of being cost efficient. 

Any other general advice I should know to make sure my offer is attractive, I'm efficient with the option period, or just anything else that will help me make this into a better deal?

Private real estate offers many benefits to individual investors, such as high returns, portfolio diversification and tax efficiency.

Very time efficient and like i said your message is dead on .. so keep that cut and paste going. !!

The properties are owned by our LLC.Assuming nothing changes from the current tax perspective, what is the "smartest" tax-efficient method of getting this equity out of our investments:1) Cash out refi $1.6m (80% LTV of all the assets) and invest that money in a more liquid (albeit lower return) investment vehicle?

And if you don't find these to be challenges, what would you want to be more efficient (aka less time and fees) in the course of a common dealP.S.

Nonetheless, going by your post only, the most efficient structure for you is the partnership structure.

What is the most tax-efficient strategy?

I have had good luck with Thrive - they put me into an efficient commercial policy. 

Pool house with plumbing Additional ~ 300 sq. ft. shop/storage buildingProperty on corner lot with 2 extra lots backing up to the end of a cul-de-sacPossibility of converting one of extra buildings to office for side-hustle/LLCGarage Appt #1:Connected to main house by a shared roof and connected breezeway~ 900 sq. ft. with kitchen/full bath/laundry and separate access/entry (stairs)Efficiency Appt:~ 800 sq. ft.