My company uses QuickBooks and assign separate classes for each asset that we manage so we can isolate them for profit and loss review.

You've been isolated in your kingdom / castle for FAR too long.

However, I figured I wouldn't let a few isolated incidents discourage me from introducing myself. 

Our market is still very strong, but the outer limits out in the county, or anywhere further than 30 minutes from a town like Bozeman or Livingston, and in more isolated pockets are taking a huge hit right now.

Thereby sidestepping the requirements to bring it up to current code while fulfilling the original problem which is the sound isolation from the adjoining unit. 

However, if there is a problem with the breaker isolate the problem and if needed get it fixed.

This affords the best isolation and asset protections ("Control everything, own nothing"), but still requires full insurance for maximum protection.One way of doing that is to have a revocable trust with you as the beneficiary.

You are right the demand for rentals by immigrants might go down, however, I see that effect isolated to areas in certain pockets around Minneapolis and St.Paul.

its always a good thing to not isolate your immediate neighbors as they can be good observers of your investments when you aren't around. imo, am pretty sure there is often a need for rooms in most urban (and sometimes rural) populations.

If your houses are scattered all over, I would argue your potential buyers will feel more isolated and less likely to be good tenants.