In essence the property will need to break even or cash flow with the formula, 75% of gross rental income of ALL units must be equal to or greater than the monthly PITI.

What is the formula to calculate an offer?

What is the formula or points of reference to calculate investing in a multi-family? 

What formulas work best for you to determine what is a good deal, what tweaks have yo made?

How does that change the formula for wholesaling ARVx.70 - Repair Cost- Assignment Fee. ? 

Are you looking at the taxes in this type of detail when analyzing a deal and if not what formula are you using when you run your numbers.

My personal formula for critical mass is: My lifestyle overhead (variable for everyone) + 1 SFH deal per month = Critical MassThis basically means, if I can cover all my expenses and planned expenses in life & have the OPTION to buy 1 SFH home per month, I would consider that critical mass for myself.What is your personal formula?

Maybe if you had a bit more experience on typical contractor shenanigans , you could have gotten through it or if the guy wasn't questionable and got you through it, it would be singing a different song.  

I copied this from a search on real estate ROE:Return on Equity (ROE) ratio calculates the amount of return generated in a particular year on the total amount of equity invested (or trapped) in a property.The amount invested (or denominator) is calculated as the initial investment (down payment) plus the entire increase in net property’s appreciation and the entire decrease in outstanding loan balance incurred prior to the year the ratio is being calculated.Cash-on-Cash Return is a similar calculation, but since the two draw backs of the traditional Cash-on-Cash Return are that property appreciation and principal debt payments are not factored into the formula, Return on Equity adds these two components to the traditional Cash-on-Cash Return calculation.A property’s net equity increase is calculated by determining what the “Net Sale Proceeds after Taxes” would be at the beginning of a year, and then again at the end of the year.

The sample looks a lot like the seller (or seller's agent) found some calculation online and punched it into a formula ignoring performance in real life.If you're a potential buyer looking at investing in this property, take a deep breath and take a step back.