Readers are advised to seek professional advice.

If the ADU you're proposing is the make-or-break between this deal penciling out or not, AND if it is pivotal for your plans that it be the height that you are planning, I would personally advise you to abandon this deal. 

@Amby BhagtaniGet an attorney involved - let them review the agreements and advise you on the next steps

Let your attorney advise you.

Readers are advised to seek professional advice.

I advise against that because once they have your deposit account information or venmo account, they can deposit whatever they want in there, even if it's $1. 

Readers are advised to seek professional advice.

or a couple of profitable Airbnb units (location undecided).Questions:Is it advisable to wait a few more years before selling the NC house?

In light of the above explanations, The information below vividly illustrates the repayment schedule for the loan.MONTHLY LOAN REPAYMENT PLAN* Loan Balance: $325,000.00* Loan Interest Rate : 3%* Loan Term: 20 Years* Monthly Loan Payment: $1,802.44* Number of Payments: 240* Total Interest Paid: $107,586.13* Total of 240 Payments: $432,586.13NOTE: The monthly loan payment was calculated at 240 payments of $1,802.44In good fate, If you fully agree to the terms ,condition and repayment plan you will get back to us with a scan copy of any form of id card for verification because your loan is undergoing approval by the board of directors in and a positive result will be out soon,you will be approve of your loan after finding all information are genuine if otherwise you will be declined of your loan so applicant are advise to provide real information for easy approval of loan to them....

I cannot find this information on BP - if anyone is aware of specific articles on this topic which are on the site (I have pro membership), please advise?