*As a side note, I think maybe it would be fun also to try and identify where new technology or machine-learning driven approaches could increase efficiency in the spaceAs for my financial situation, personally, I have around 50k saved but 20k of it is tied up in assets I don't want to pay capital gains tax on.

A quitclaim deed is a straightforward way to transfer ownership, but it doesn’t address tax issues.

Your taxes are none of the ex wife's business and this would seem to address your concerns.I would also put her on notice that future requests for financial discovery will be two-way and if a discrepancy is seen in the other direction you will seek support from her.

With all due respect, I don't believe offering your email address  is the communication your investors are looking for.

Start by leveraging your skills to identify undervalued properties, perform cost-efficient renovations, and build sweat equity.

You can print this one on your computer, no need for the “official” printed forms.W-9 asks them to enter their name, address, and tax ID – which can be a SSN, ITIN (for people who are not permanent residents) or EIN (business tax ID).

My wife and I move into the house since we are looking to move to the area anyways, and we all do a lot of the rehab ourselves, probably with my wife and I doing a little more since we would be living there.In this case, how does the friend with cash get their money out of this deal in a time-efficient manner, since they're primarily looking at this as a flip? 

If anyone who professes to teach you something about real estate cannot or will not identify 10-20 specific, verifiable addresses they currently own and rent out, or have flipped, or optioned away or syndicated or whatever, they do not deserve any of your money. 

We are trying to bring money into Portugal in the most tax efficient and legal manner possible. 

Coghill they are trying to take care of several things:1) Approval to access credit reportsA video tour of my home office (required by the credit repository to show security, so access to office & computers is limited to avoid data theft)Credit checks on me and my partner (required by the credit repository to make sure you are not criminals looking to steal others' data)Copies of the deeds for every property we own (required by the credit repository to confirm you aren't just self-serving)A copy of my partner’s home lease and utility bills (required by the credit repository to prove his legal address, so they can pursue him criminally if he steals data)Business phone bills (required by the credit repository to prove an actual business)2) Approval to use banking ACH system to accept tenant payments and pay ownersBusiness phone bills (required by banking industry to prove business legitimacy)A signed letter from the bank verifying our accounts (to prove legitimate business banking accounts.