In general, I'm curious if this is a good investment opportunity long-term and what other information I should know to help make the decision.Here are some of the numbers:Property Value: Estimating ~$800,000, but it hasn't been officially appraised since it was purchased 10 years at $500,000.Taxes: $4,000Insurance: $2,100Year Built: 19125 Total Units: 2Br/1Ba, 2Br/1Ba, 2Br/1Ba, 1Br/1Ba, StudioUtilities: Owner pays only water and trash.Mortgage: Despite being zoned as a 5-plex, the property has been approved for residential mortgage previously (one unit classified as storage during appraisal).Previous Gross Rents: $45,480 (previous owner was very generous with rent to family/friends)Estimated Gross Rents: $69,600 (based on market value)Previous Annual Expenses: $12,500 = 27% of gross rent. 

This is probably going to be the most unique recession that we have ever seen and I personally think that normal measures of classifying disaster based off of classes are not going to work, I think that it's more likely that this will be a case by case scenario depending on industries hardest hit and what mix of tenants you serve.

My mother does the books and I manage the rental contracts and do some of the repairs or meet with contractors.How should we classify the income from each property and file taxes?

At the moment, real estate is NOT classified as an essential service.

To classify a good cash flow is to submit to a subjective opinion; what one investor may consider good cash flow, another may completely ignore.

Right now I am trying to stick to what I classify as an emergency.

When the appraiser got to the property, he refused to complete the appraisal as an SFR, and instead, wanted to classify this property as an up-down duplex because of the above-mentioned characteristics.Normally, this would be no problem.

Finally closingAfter multiple appraisals and going back and forth with FHA underwriting, the property was officially classified as a duplex, and because I had a non-occupying co-borrower, that took my required down payment from 3.5% to 25%!

Based on the facts and circumstances we know here I'd struggle to classify this as an investment asset. 

As far I know based on various data and observation  covid either does not exist or is basically a cold/flu/pneumonia that has been classified as a covid.