They were able to source, close and are learning through a 43 unit MF that cost 7.3mm to buy and has a capex budget of $500k. 

Has anyone have a reliable source if Corona Virus Covad-19 can be spread through "Central" HVAC Chillers??

(source: EIA statistics)

What on earth am I supposed to do as this is a main income source for me as a good landlord?

This slowdown may effect your job / source of income.  2. 

Do a routine inspection, check the plumbing under the sinks, check the drains for free flow, check for running toilets, check the base of the toilet for leaking flange seal, dripping faucets, change the furnace filter, inspect the attic for potential roof leaks, check the condensate pan under the HVAC, check the pan under the water heater.Common sources of smells are pets (especially cats), kids peeing somewhere other than the toilet, garbage/refuse not being properly disposed of, plumbing issues.

From the PM side, we have seen owners reach out with concerns about tenant's abilities to pay rent and tenants who have lost their source of income.

It still says rent is due and offers other sources to use that might help the tenant.  

RE agents who specialize in investors are a great source. 

By feeding the HELOC with all my rents and other income sources, the average daily balance stays much lower and the result is a mortgage that gets paid off way sooner.Have you heard of a HELOC credit line being shut down prematurely?