I likely would take a safe approach in my underwriting and value it with the quads then subtract 15% off the total.  

and subtracting that from your end value + whatever equity buffer you want to account for.- If you're going after a seller finance deal I think once you understand what it will take to get to a finished state its simply a matter of aligning your needs as far as short term cashflow with the current rents/situation, with the net number the seller needs after the refinance.  

Subtract $2300 for one unit and they're paying $1400+expenses to live in a $2300 month apartment and area.

Subtract the flat fee buyer agency fee of $6000, meaning the buyer is credited $6,500 at closing.

You cannot calculate rent by subtracting off the rent of the ADU.  

I would count on having at least half market rate tenants, in the event Section 8 rents are higher than market, which they are in our market (granted you will need to subtract the utilities from the rent).  

This is an alternative approach for newly constructed buildings.RESIDUAL ESTIMATION APPROACHThis approach determines the cost of short-lived assets, such as 5 or 7 year property and subtracts them from the total project cost.

I would pay once and then immediately look for different cleaners or subtract from year end bonus.

To really know if a 1031 exchange is worth it for you, you first must find out what your net gain is and subtract state and federal taxes from that.

Subtracting the $1600 leaves $700 of profit with each new house.