I’d like to find a house that we will eventually live in, and rent it out until we’re ready to move.

Hello there, I thought I'd chime in to add to the original questions in case it helps you @Shawn Chervinskis.Can I use Solo 401(k) as source of funds to pay 25% down and leverage debt for remaining principal amount to purchase a duplex that I will owner occupy and rent the other unit?

If I were you I'd interview/talk with people at smaller boutique companies and larger companies BOTH in industrial and multifamily.

I'd list it at the median, but it all depends on location. 

I'd do it again if my wife would let me! 

I’d sell them all and 1031 them into cash flowing SFR.

One thing I'd keep in mind with mid-term rentals is I expect the mid-term rental market to get highly saturated at some point just like the STR market has.

The agent told me that Tower Hill (the insurance company) can’t adjust the occupancy status and that I’d have to rewrite a new policy for occupancy.

A few thoughts:1) I echo @Simon Ashbaugh recommendations. 2) I'd recommend talking with investment focused real estate agents and finding one that understands the area your interested in.  3) Get a investment analysis spreadsheet or use the Bigger Pockets Calculators to run numbers on as many properties as you can in your area (try to run calculations on 3-5 buildings per week) to figure out what's a good deal.

I am in Arlington so if you ever want some “boots on the ground” to look at a property around here, I’d be happy to help out.