We rehabbed 2 of the 3 units and brought the rents up to market value.

Doing it Leon Johnson style with "Now I'm going to get real personal now, if I brought that $650k in cash in a brown paper bag, and set it on the table, what would you do with the money?"

It was brought to by a person I met at a BiggerPockets meetup.

This was brought to me by my Property Manager but had been listed on the MLS for a while.

Otherwise, towns and counties would never get a chance to increase their revenue :-(.  ) basic research on setting up your proforma prior to purchase should have brought this to your attention, as should have bank when they assessed (if you used a loan), your agent (if you used one), and/or your accountant (if you used one). 

The CDC website sends mixed messages, which is why I brought it up.

I brought in a contractor to finish a lot of work that I was taking months to complete, they got it done in days. 

No, they would not and if they brought up that you could afford more and why don't you come up, you would respond, I can spend more on other houses that are worth more.

Which factors should be brought into the equation - comparable rentals in the area?

After talking with some officials, I know the city would love to have this property brought back to life.