I have not found  a true formula for getting offers accepted with FNMA as I have a better idea with HUD. 

However from my understanding we can use this formula as many times as we want and then roll the current property over to a portfolio loan once there is enough equity.

And oftentimes, as I’ve found out there is no ONE formula for deducing these assumptions.

Is there a rough formula for calculating improved value of below ground square footage?

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So if you want to get your 10-15% back than you use a formula that increases the loan amount and then you receive your funds back. 

Moe, call some local investors and get their formula for "what a deal is". 

I do need to ask and please forgive me if this sounds naive; let's say the property is in good standing (minimal repair etc), do you think it would be wise to use the 70% ARV formula and at what point would you say it no longer fits a "wholesale" criteria?

Aside from the 2 years I have in operating the business I spent years researching and creating my formula...On top of the on-the-job experience. 

(b) If the records of a series are maintained in a manner so that the assets of the series can be reasonably identified by specific listing, category, type, quantity, or computational or allocational formula or procedure, including a percentage or share of any assets, or by any other method in which the identity of the assets can be objectively determined, the records are considered to satisfy the requirements of Section 10A-5A-11.02(b)(1).