Can you provide details that the building was zoned for multifamily in previous zoning overlay ( this will help support the case)?

That is why you should work closely together with qualified professional who can review all of the details and provide you with the proper guidance. 

As far as the small details of managing rentals though it's really great. 

Send me some details on this property, I might be able to help.

At least make the offer look like you did a detailed analysis and it came from your calculator.

Message me and I’ll send you the details.

One important item of a good answer would be knowing your goals  If the answer of yours is that these are on a short term investment I would tell you to sell both units if it is a hot area and is a sellers market there I would probably say to sell both of them as soon as possible if the seller's market continues and I might not spend your own or borrowed money before you sale.  

Here's the breakdown:* Properties - has rollups from Income, Expenses and Reserves tables to compare P&L across properties* Tasks - notes and action items and when things are due.

PM me for more details.

It depends on many items.