Seems like a lot of people are recommended them here. 

I would recommend having a conversation with your tenants and letting them know of your interest in selling the property to gauge their interest in terminating their lease early - or if you have a termination clause, invoke it. 

When you go to sell, Montvale requires a certificate of occupancy so this issue has to be resolved in advance of a sale.Although I am not a lender, I assume you will not be approved for an owner-occupied mortgage on 5-units if it is a legal 4-unit without some type of mortgage fraud whether in reported rents, units, or another legal document or representation (very very large issue from a legal perspective with multiple arrests in the last year for anyone playing fast and loose).As far as the DCA, I would recommend coordinating your work with the city with the DCA.

I'm going to leave the minute details out, but it was quite the adventure trying to get my money in the right place (and that wasn't due to error or time issue on my part, or dragging of feet in the bigger financial institutions), even when using direct preferred/recommended vendors to RADD IC.

We were using a 4th (not on your list) but I cannot recommend them. 

You'll end up in court with a lease agreement that says rent is $1, and the recommended tip is $1,999.

What is the recommended R-value to use?

They also have calculators to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.

it will show you how many times it was sold and how much they made (usually millions)Hi Laura, would you please recommend a dependable service who would produce accurate, high quality, court-ready documents?

None of which I would recommend.