I was choosing to have the sewer fixed and throwing a bone to the seller to take on the very needed, and extensive tuck pointing SOW myself to help the deal move along.

Have you asked the HML for an extension?

Needs extensive work but don't know true extent.

Renovated with cosmetic updates for immediate rental income, it offers strong cash flow while preparing for more extensive repairs and the addition of an ADU.

Anyone investing in a product new to them is never going to have perfect knowledge going in; extensive knowledge is accumulated over time, and, well, if you wait for perfect knowledge you’ll never invest.  

Extensions are likely granted, if needed.You will receive $3k relocation assistance at the end ( unless you have other liens, back due water/sewer/HOA etc. ) You can also stay in the home until the sale closes, which gives you at least a few months payment free to be able to figure out where you will relocate.

Happy to have a conversation as I have extensive experience working with non-US citizens.

Maybe the work is so extensive that it won't make them a profit?

I added value to the deal by initiating cosmetic repairs to make the units rent-ready while preparing for more extensive renovations.

I am also planning more extensive renovations to modernize the home, which will further enhance its appeal and value.