Given the $50k in the HYSA, you have more than enough covered for your emergency fund.

If so, I would consider that route and redeploying the funds into a truly cash flowing property or a REIT or something.

This is partly due to low inventory and no additional land to build to keep up with demand.

You can't roll over Roth funds from other IRAs into the Solo 401K Roth portion (so beware of that, if you have now a big chunk of your retirement funds in a Roth). 2.

(source below)I ran these numbers on my own portfolio (of 9 units, 4 properties, mostly updated with Low CapX) in Green Bay, WI and my tenants are paying on average $1.08 per SQFT and moy cost is $103 PSF. 

Here are some reasons not to sell:- 2.7% loan is very low by today’s rate.  

Based on the numbers, the sellers price is too high, their interest rate is too high, rents are too low. 

Fraudsters prefer these dates because it's the easiest time for funds to disappear before anyone notices. 10.

You would still be looking at having to fund say 30% of the deal and the second would of course have a much higher mortgage then the first.

If you sell right away, you can then keep half the profits (or whichever percentage you like) as a reserve and purchase your second with the remaining funds.