Its thin and runny so when it dries/cures its naturally flat and level.

An ounce of prevention is worth a pound of cure. ...I've bought properties with bad sewer lines, but I KNEW what I was buying because of the scope, and I factored that in to my numbers and offer...without the scope, I would have no idea what I was buying, and I would've wound up with a significant unanticipated capex.We inspect every other part of a property before buying.

If you are "cured" of your analysis paralysis and have the capacity to stomach the project and the "issues" that come with it, I vote BRRRR.  

The principal sum, plus all accrued interest, as defined above, shall be paid to the Holder upon as set forth herein.Payment & Due Date: The Maker shall not be obligated to make any payments ofprinciple during the term of this loan until January 4, 2024 ('Due Date"), at which time the entire principal balance, plus all accrued and unpaid interest, and other charges, if any, shall be immediately due and payable in a lump sum balloon payment to Holder.Collateral: This Promissory Note shall be secured by a mortgage lien against thefollowing real property: Address listed; (the "Property"), executed by Maker for the benefit of Holder.Assignment: This note is NOT assignable by Maker without the written consentof the Holder, which shall not be unreasonably withheld.Default: The occurrence of any of the following shall constitute an "Event ofDefault':Failure to make any payment due hereunder;Nonpayment of principal upon the Due Date;The breach or failure to perform any of the terms, provisions, conditions,promises or agreements in the Note, that is not cured within five (5) days ofthe date of written notice from Holder;Any representation or warranty made or deemed made by or on behalf ofMaker to Holder under or in connection with this Note shall be materiallyfalse on the date as of which made;

It is delinquent enough (Greater than 90 days but below 120 days(can't file first legal until after the 120th day by federal rule (Except under very very specific circumstances)) to where the lender or servicer has sent the breach letter (Notice of pending foreclosure) with an expiration date that the loan will be referred to a foreclosure filing (Trustee/attorney) if the borrower(s) don't cure the breach within that defined period of time.* A notice of default is not a letter sent by a creditor saying they are late.

Presently, we (the Attorney) just sent out the Notice of Default and the Borrower has 10 days to cure.

Notwithstanding any other provision of this note, in the event of a default, before exercising any of Lender's remedies under this note or any deed of trust or warranty deed with vendor's lien securing it, Lender will first give Borrower written notice of default and Borrower will have ten days after notice is given in which to cure the default.

Water and sewage main laterals are all at the street running perpendicular to the lots, Power/Internet lines as well. 

The one good thing about such a provision is that it allows the senior lender to start foreclosure (or notice of default/cure period) immediately.      

Your worry is if the pipes are in tact and if the water and sewage flows out.