Example attached (link below) and inputs assumptions below.

We had been landlords for many years providing way-below market rate rents.

Landlords will tend to keep there rent below market, due too being poor business managers, and as a result silently lose thousands, if not tens of thousands of dollars as well as devalue their properties at time of sale.

Also have seen a couple realtors, recently, list houses slightly below market value to make the quick commission, which has a negative impact on the comparables for the short term, which is why I am looking into the lease option approach. 

The rent for the entire building $700 below my max rental budget of $2,000.

@Rolando Garcia - I am not in your area but the following questions below are questions you want to ask to make sure you have the best Property Management and Title Company, regardless of where they are located, for real estate investors. 

(Link below)  I live here, and EVERYONE I know with the exception of a handful of lifelong New Yorkers is preparing to move just as soon as they can.

Below is a contact that might be able to help you but he's in Palm Desert - not sure if he does work in your area.

Currently for Owner occupied I get 4.5 or below and 5-5.25 for investment properties with loans at 300K or higher, Check out a private local bank or chase who matches rates possibly.

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