You're asking about "finding" - are you finding and putting under contract, or simply just a referral ("finders") fee?

Business does not allow customers to simply walk away without consequences.

Were not completely green behind the ears, We know the Seattle market is tough, but with being in the military, I am no stranger to adversity or a challenge.

So I have a Pine  tree that fell and broke my fence, but the main problem is that it has not completely fallen and the fence is holding the tree up at the moment and it is leaning over my neighbors house.So my problem is I called my insurance company they said they will send a adjuster to asses the damage but they stated  I need to call a tree company and have the tree removed and that I have to pay for the tree to be removed and they will re imbursed me.

You still have to drop your fee in there so it needs to come down to $510k at most if the house is completely rehabbed, updated, "move-in ready".If it's not, which it's probably not...$650k x 70% = $455k$455k - $10k for minimal work = $445k$445k - $7k your desired fee = $438k$438 is the MOST you should pay, and that is assuming very light rehab. 

We plan on having 4 units cash flowing and once paid off in 5 yrs we will use property equity to complete the remaining unit.

I would absolutely do it yourself unless you simply don't have any free time.  

Do I need to register as an out of state LLC if I am simply a limited partner in these crowdfunded deals?

I completely agree.

There would be additional review at this point: ordering the appraisal, downpayment requirements, and the paperwork for the rehab draws and terms.The local banks I've worked with required 25% down on the purchase price, the rehab was done in drwas after the inspections, but all one closing and then the loan converted to a permanent loan once the draws were complete.20 year term resetting every 5 years, for me.