You can ask them about rent trends in the market as well as how they anticipate rents will be affected by current events.2.

Any books, articles, tips/ tricks anyone has would be greatly appreciated!

I take this with a grain of salt as long as your market is already trending downward. 4.

And @Bryan Trelegan is correct, we are starting to see a downward trend in prices which will mean that it is a great time to purchase long term buy and holds. 

If a tenant is late with rent a simple reminder text does the trick 9 times out of 10. 

So even if you find one that says yes today, if things start trending worse in the next 6 months, that policy could very quickly change.

But this 3rd party company is letting us know that real estate sales are still going strong.https://www.cnbc.com/2020/04/07/docusign-ceo-dan-springer-on-the-activity-trends-among-its-customers.html

Days on market have increased, however that trend was already occurring prior to COVID-19.I'd had several investors reach out asking about the awesome deals. 

This 10 year trend report was just released which I thought would be interesting to buy and hold investors. 

The key is finding properties in these zones that are also selling very cheap and have high rental demand with a viable tenant class and positive forward trends.