You'd get a hybrid of benefits of primary residence for 1/4 of the property and the other 3/4ths of the property you can depreciate, and write off expenses as if you're running a business so it provides a tax shelter for your business related activities while simultaneously still providing you that tax free primary residence exemption (IRC 121) on 1/4th of the sqft of your home so 1/4th of 250k single or 500k married means you can get 1/4th of that tax free of the gain potentially.

When you reach the desired "width" of flip properties, you use to the profits from all these simultaneous flips to buy holds (among other uses for it).  

Based on my experience: - Interior and exterior can be completed simultaneously (assuming the exterior is solid enough not to compromise the interior during inclimate weather)

There are ways around it, like doing a simultaneous close, but you're going to need to put in an offer with proof of funds.

I am looking for a good title company that is experienced in doing simultaneous closing for option deals and selling houses to rehab investors.

Thanks Justin, The title companies I talked to so far doesnt allow simultaneous closings but I will keep calling more places.

We're able to access it simultaneously.

You can't lock in your section 121 exclusion and simultaneously convert your primary residence to business use forever.  

(Package a, b and c) all totaling up to the down payment needed.Realistically I can build 10 homes simultaneously.

can I just make an all cash offer w/ a 30 day close window and farm it out to an investor and do a simultaneous closing?