I plan on keeping it as a buy and hold type investment and installing central air and re-doing the siding on the property at some point.

This is not your problem, I'd ignore it.Their renter's insurance should cover any lost contents and their auto insurance should cover any damage to the vehicle.

So my issue is if I fix my side, there's a chance I'll damage theirs or even mine more.

Mine said that they do it mostly during times of physical damage like that resulting from hurricanes.

I personally stay at STR 4 months every spring/summer (this years up in the air).  

Tenants complain about rats chewing wire on the car parked at parking space, i own only one unit in 48 townhouse complex m I responsible for the damage?

Hi Renee, I recently listened to a video message which I believe was posted on Air BnB as I also have short term rentals.

I also wonder if we can claim damages for existing commercial vacancies since prospective tenants have all evaporated.

Hopefully their debts will not exceed their damage deposits. 

You guys are so doom and gloom, come on man, the fed (that caused all this btw) is going to save EVERYONE, Banks, credit unions, trust and mortgage companies, investment banks, underwriters, brokerage firms, hard money lenders, stock speculators, the airline, auto, restaurant,hotel, bar, retail, casino, and travel industries,money market funds, the repo market, the global fx market, the stock market (direct purchases soon), the bond market, the derivatives market (oop's sorry ronin capital), consumer spending (helicopter money only 3 weeks away), your local bowling league and oh yea, air bnb.Don't worry the largest financial event of our lifetimes, BY FAR, will be over in a jiff and you will be rested and ready to get back to work!