Maybe you want to pay interest when you sell and on some deals you will pay internet monthly (for a lower rate)...many possibilities. 

Lot size: 9,365 House size: 760sqft (2bed 1 bath)Zoned: R2 for Duplex Owned Free and Clear Possibly have to fix foundationI have already contacted an architect to give me an idea about pricing but I had a few questions before I send him info. 1) how do I determine what size I would want the duplex to be. - based on other duplexes around?

We would determine a date for a balloon payment where I would refinance the property into my name.

My point is if you use initial cash flow as your primary criteria then you are ignoring a lot of the factors that determine the return on a long term buy and hold property. 

Could anyone assist with some ideas, strategies, and/or guidance around determining a property's square footage in New Jersey?

@Mark VesuThe way I would determine whether you would get a better return renovating is how much it would cost to renovate compared to how much you will be able to raise the rents. 

My goal by shadowing an investor, is to not only learn skills hands-on and grow my network, but determine what investment strategy best suits my financial status.

Trying to determine what the best materials are for a rental property.

I agree, taxes is no reason to stay married if you are determined to get divorced.

You need to determine where you draw the line and if you are pass that point, you will just have to back out!