All my properties cash flow extremely well.

Their campaign will tell you that it only affects those who make over $400,000 in a year, but what they do not tell you is that the capital gain triggered by the sale of real estate would be included/counted as part of your income for the year. 

Our market is extremely strong.

We acquired a new multifamily property in the height of covid this year with a handful of tenants paying extremely under market rent (read, less than 50% of current market rate).

@Nick Gerli the Austin MSA has an extremely low housing inventory at present so increased permits would be a relief for many buyers who are competing for available inventory.  

You would also not have to pay capital gains doing this, so it could be much easier with potential timing, as well as allow you to borrow at the extremely low rates now. 

There are so many questions answered here...an extremely valuable resource!

Seller was extremely motivated.

More specifically, can this be done legally without triggering the "due on sale" clause in the original mortgage?  

OK, not seeing this as the end of the world, but there are some troubling things (based on what I see in Portland and watching news):1) No inventory means in PDX people are reaching beyond FMV on housing and abetted by cheap loans2) Debt service issues - I'll take the extreme, look at retail in NYC, there's lots of space empty at $80/SqFt.