The agency who administered this grant backed the mortgage note so the bank had little to no risk on the note.

If so, you should verify that the SDIRA custodian will administer this type of asset in your IRA account.

Check with the local authority that will administer the lot split.  

Maybe the estate has to be administered in court to get clear title, although where I am sometimes a title company will insure title without an administration of the estate if the next of kin are clear and by executing some affidavits attesting to the kinship.

If so, you most likely need to open and administer the estate to cure the tax and title issues that can occur from nonpayment.

I would have to roll the regular 401k into a company administered Roth 401k.

The other major point this recommendation leaves open is, if the loan documents call for the Mortgagee to administer an Impound Account (escrow-same thing), then that action must be done.  

Here's the article: "Low- and moderate-income aspiring homebuyers who have been shut out of the market because of stricter lending requirements may have better luck achieving the American dream through a new 15-year mortgage with no down payment, no closing costs and no credit score check.The loan also allows borrowers to buy down the interest rate — from their own savings, from funds provided by the seller at settlement, from government sources or gift money — lowering their monthly payment to an amount equivalent to a loan amortized over 30 years.The Wealth Building Home Loan, introduced a few weeks ago, is funded by Bank of America and Citi Mortgage and administered by the Neighborhood Assistance Corp. of America (NACA), a nonprofit, HUD-certified housing agency.

Would I be the witness if I am administering the document? 

@Tariq BahayAlthough Section 8 is a federal program, it's administered at the county level.