Thanks Bob. I appreciate your attitude on this and your suggestions. I'm going to be contacting all of my tenants and asking them to let me know ASAP if their income is jeopardized by the current emergency so that we can figure it out. Agreeing on a discounted rent amount as long as it's paid by a certain date is a great idea.
I already have a lot of Section 8 tenants and tenants who are in steady employment but working on repairing their credit, leaving a bad situation, etc. Letting tenants "borrow" their security deposit for a month's rent as you suggest is something that has worked out well for me in the past.
I've received partial rent payments from local churches when tenants were having personal emergencies, so that might be a suggestion for tenants. Also from Catholic Charities.
I've had security deposits paid for by programs helping with specific situations (ex. domestic violence charity to help a woman and her kids get into a different home.) I'll ask around with my activist/housing advocate friends and post any suggestions they have.