@Mark DavidsonYes, a Solo 401(k) can use debt-financing as you suggest, so long as the debt instrument is non-recourse and everything is isolated within the plan envelope. 

First look at your bill to see if CCF has gone up proportionally.If it has (you are using more water), then how many meters onsite to isolate where? 

A typical ducted central air system where there is a single system for multiple units has other downsides: 1. landlord pays the electricity for the AC (nothing else is really fair to tenants); 2. single thermostat (unless multi-zoned somehow); 3. air isn’t isolated among the units - the return air goes back to air handler from all units together - so the air from a coronavirus infected person isolating at home potentially spreads to all units.

And if the current vaccines, now being tested, don't have hoped for results in 2021; then another approach will be needed with this virus, & willlikely be a testing-tracing regime, in which the effort is for who has the virus, & then to isolate them, so they won't be spreading it.

Not sure how to isolate and fix if we can't replicate the problem.

I want to isolate this property from my other personal assets and have been looking into using a Series LLC, as this is the first of many properties (I hope). 

The Chinese started it but were able to build hospitals in days and isolate patients immediately to kill the curve, the US and Europe cannot do that.

It's a challenge for me because I very much dislike where I live - it's a small town in Montana isolated by 90 miles of mostly nothing to the next town, which is isolated by at least 90 more miles of next to nothing. 

But one should never look at cash flow in isolation.

.- 30 day min rentals (the deal breaker)- In person check-ins (additional expense or at minimum a time investment)- Noise monitoring devices required (a small expense, but this one I agree with)- Max heads in beds (although reasonable at 2 adults per room)- Posting a contact number in bold for the public to see (100% need to pay for cameras and an alarm if this one passes, that sign might as well read "rob this house").I'm all for regulation, I just hope they don't "government the crap outta this" and in an attempt to control isolated incidents, make a system overly complicated and expensive, therefore no longer profitable to the small guy.