So my wife and I have been fortunate financially through hard work and lots of schooling. Long story, as short as possible, we are mid 30s with $600,000 retirement/investment portfolio. We max out 401ks and backdoor R...

We are not planning on permanantly occupying  the property until retirement in a couple of years, but do want to use it occassionally when time allows. 

Going to call an exterminator to take care of the mouse but also want to permanently stop future occurances. 

If it is decent and inhabitable, your lender should be able to finance it If it is not inhabitable, then you could get a construction loan through your lender to bring the property up-to-speed and then refinance into a permanent loan once it's done.

@John Lindley  1)  get a HELOC  in place for the max amt  you can  on present home while you still live in it  2) consider a conventional loan versus  a FHA loan  as  your down payment can be  jsut  as little  ...you can avoid the FHA UFMIP fee of  1.75%  and your mortgage  insurance isnt  permanent ....kepe in mind if you use the  HELOC for the  down payment - this  heloc debt  needs to included in ratios   ...if you need rental income on home you are moving from to  help  on qualifying   - you will need an actual rental agreement in place 

What would be your permanent solution once they move out?

Structural improvements to the home, such as additions, framing, or other improvements that are permanently affixed to the home. 2.

Just let the renters know that they need to tell you if the kids become permanent occupants.I'm more concerned about grown men that don't have jobs.

I will have more business there soon and I’m planning to move there permanantly in the future.

So I think you should sell your home as if you want a permanent residence at your new address.