@Nicholas Haubner Contact Montvale's tax assessor and building department to see it is currently classified. 

We then like to provide our clients with photos, tax information and comps.

Nice, but confusing.Our situation: FICA for kids turning 18 while working for us.So, the only thing we can conclude so far is that the age definitions in the tax law are wildly inconsistent and unclear.

I assume your prop tax increased 1.1% to 1.2% of the ADU cost even though the ADU only valued at $75k???

A FHA 203k Loan is where the purchase price and rehab costs are rolled into a single loan.Assuming you have a respectable FICO you can buy, with a FHA Loan (3-5% down, a 30 year amortization schedule, and a residential loan rate) AND because you closed personally, you will not have Asset Protection, in the form of closing in the name of a LLC/ LLC taxed as an S Corp, or an S Corp.

Option 1 - NOI = Rent - (maintenance, vacancy, management, property tax, insurance)or Option 2NOI = Rent - (property tax, insurance)in both cases i assume DSCR = monthly payment/NOI

You will have to gather more accurate operating costs (vacancy loss, taxes, utilities, insurance, mgmt fees, maintenance, HOA) to best determine potential future performance.

Medford also just voted to increase property taxes which is another reason to act. 

I can do all the due diligence beforehand, except the soil I have bought a ton of land at auction and tax sales over the last 40 plus years..

Never invest in any city on this list of the 50 most dangerous US cities.Low operating costs: High operating costs are one of the driving factors for many companies, leaving states with high taxes, regulations, and other costs.