I am wrestling with the choice of saving up for my primary residence, which will take time, versus starting to invest now.

The choice is all yours.

Sufficient insurance coverage is also important and is essential for those with assets at risk, esp. if not forming an LLC.

Make sure to build a sufficient safety net of cash to fall on at any given time. 

So if there is not active business inside of the LLC or if the LLC just holds rentals - that is not sufficient to establish a Solo 401k plan.

If you are trying to use profits for other means then keeping the house in the 401(k) might not be the right choice for you.You can certainly cash out these plans now, take the tax hit and invest in real estate.  

With that being said, I would choose FL over OH (since those are the 2 choices you gave).  

Naveen Kumar Ignoring PM choices, which I recommend if don't have any experience being a landlord, you can't really BRRRR a condo.Condos have a price uniformity to them as long as they aren't foreclosed.

@Gabriel Floyd, you've got a few choices but none are ideal.Your gain is roughly 50K plus a lot of depreciation recapture  (maybe another 40K to be recaptured).

I know what the responsible choice is but it's just going to be a rental property so I'm sure it doesn't matter all that much.