I have only been doing this for 5 years but what I have learnt is that it takes money to make money.  

Money talks and BS walks.

I would spend the money to meter the units separately.

Quote from @Samuel Hudson: Hello friends I am new the market and recently bought a home in Weehawken 6 months backs .Its a three family home and we are currently doing renovations Right now.The rent leveling board told me that two units would have to follow a rent of 1650 for unit 1 which has three bedrooms and another unknown amount for unit 2 which they don’t have the information for .The previous seller I purchased the property from bought it as a tax lien .He has kept the property vacant for two years with no tenants before selling it to me .However ,the previous Owner he bought it from must have had tenants .I am putting in a lot of money into renovations and want some clarity on the situation I am in .The property has been vacant for the two years and currently still is as we are doing renovation .It would be really appreciated if anyone can assist me on what information needs to be provided by from the previous seller for me to be able to set the rent based on the market value .Thank you . 

But. you'll have to see what your net gain is before you can see if you'll save any money with your 1031 exchange.

(and money of course, but that can come from these things)

You could offer cash for keys to get her out-NEVER hand over any money until they are out and you have the keys and signed paperwork that they are out of the property. 

You might save a full percent just doing that and you have tons of money you didn’t pay in points.

Do you have money set aside?

To get things done as quick as possible , charging by the hour cost the contractor money , charging by the push/inch  is the most profitable way to do snow .