Not sure there are many sponsors that would come out of pocket like that. made no return for 3 years but got our principal back which is a win in my book..

Will I still be permitted to file an affidavit of memorandum EVEN THOUGH my closing date has now come and gone and I am technically in breach of contract?

This happens when the loan is fairly new on the house so the principal hasn't been paid down much.  

I've included an example below to help illustrate this.So different lenders have different rates (which do vary even for DSCR loans) but these are factors they all consider.See example below:DSCR < 1Principal + Interest = $1,700Taxes = $350, Insurance = $100, Association Dues = $50Total PITIA = $2200Rent = $2000DSCR = Rent/PITIA = 2000/2200 = 0.91Since the DSCR is 0.91, we know the expenses are greater than the income of the property.DSCR >1Principal + Interest = $1,500Taxes = $250, Insurance = $100, Association Dues = $25Total PITIA = $1875 Rent = $2300DSCR = Rent/PITIA = 2300/1875 = 1.23If a purchase, you also generally need reserves / savings to show you have 3-6 month payments of PITIA (principal / interest (mortgage payment), property taxes and insurance and HOA (if applicable).

However, this approach might add complexity, such as additional tax filings, self-employment taxes, and administrative costs.

The parties can pay off the note for principal balance, late fees, penalties, back interest and legal fees any time before the actual foreclosure.  

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

Filing/recording the mortgage is what establishes the creditor/lien position and puts your ahead or behind other creditors who may be using the same property as collateral (secured and perfected vs secured but unperfected).

It contains hundreds of files such as ebooks, checklists and spreadsheets for real estate investors: https://www.biggerpockets.com/filesGood luck.

If you have lived in the home for a total of two years anytime within the last five years you qualify for the entire $250k tax exemption if filing singly.