The garage is underground and has a concrete slab above. No 2 posts for me, 4 posts only
There are some features of your project that are very reminiscent of my garage project, completed a couple of years ago (three stories, all connected by spiral staircase, with tunnel in lowest level connecting to the basement level of my home). At one point, I was considering a "car elevator" to move cars between the 1st and 2nd level. I wonder if they make a product that would serve as a "useable" lift, and still function as the floor of the second story/ceiling of the 1st story, when in the lowered position.
Note: garage in attached photo is not mine
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