We've done a bunch of work to the house including, a complete kitchen and living room demo, and adding 2 additional bedrooms to one unit.

Would you sign a one year lease with a guy you've never met who just started the demo on a home in that condition? 

The home may or may not need to be demoed.

Good suggestionOn one of my first rehabs I had an issue relating to major unexpected deficiencies in electric and plumbing systems that were exposed in demo and not in the budget. 

Can do anything from my mobile phone.I hope to test Rent Manager soon but they have not contacted me to start my demo.

So all you need to do is start getting your contractors lined up and scheduled to be onsite the day after you close (or earliest possible day) to begin your demo and then re-construction of the property. 

I paid 206k for this what turned out to be a tear down.. spent 245k building a new home and of course demo  2k sq ft at 100 a foot plus demo.paid cash for house got 10% money for vertical  ( did not have my banking relationship I know have at the time so higher cost money but only pay on advanced funds. )Sold  720k numbers206k + 245k + 20k cost of capital  + 5% commish  36k + 10k misc =  517k all in say 520k (720K) = 200k net profit... double my money cash on cash one year.. pay tax of 60ish and net 140k after tax.Not bad...  

I would start with demo & trashout.  

You will have to show the planning dept. existing and proposed plans, with a demo plan showing any existing parts of the house being altered by construction.

@Jay Leisten I need someone to do some concrete demo and work on a leaning stone retaining wall does anyone have any referrals