The floor has quite a few issues (high points, low points, pitting, flaking over an 8 sq ft area where there was a plumbing leak that they caused, and many sections are still wet even after a week).

Thank you @Michael Smythe Detroit, MI is my last option but within my radar due to my low budget.

Lay low and stay out of the crossfire.

There is an extremely low success rate going this route.

Fixer upper MFH could be low in inventory but normal ones are still there

2% option money is on the low side. 3% - 5% is more the norm. 

Given that your rental property currently cash flows over $3K/month, the DSCR might be too low to qualify for the full $900K loan, unless you can show additional rental income or strong reserves.If your goal is to access that $200K for another investment, refinancing with a DSCR loan could be worth losing the low 2.99% rate, especially since it would eliminate the high-interest HELOC.

The fact that your mortgage balance is relatively low with a 2.375% interest rate is a solid advantage here.

Low inventory, but they exist.

Interest is low on the house and has a great cash flow, always has been.