I suspect I was almost cut out of this deal by a more experienced investor (my guess is they were waiting for my contract to expire so they could swoop in).

If mold is suspected in the ducts, you could consider having the ducts professionally cleaned before replacing them to see if that helps.I hope this gives you a starting point for further action, and I truly hope you get this resolved soon.

A smart seller might ask for some kind of limit to the Subject-To financing but I suspect that many don't because they are facing foreclosure and therefore aren't buying another house anytime soon.

Sub-to's still have a place IMO, but the Guru's may soon have to start re-thinking their sales pitch to the newbies...and I suspect those who continue to sell these on wraps may be want start picking out a good attorney as I imagine we'll soon see class actions and likely some more state and/or federal legislation. 

I also want to put a strong emphasis on what John said.In 2020 there was a "fund syndication" that was investigated by SEC as it promotes real estate with fraudulent mechanisms and is suspected as a ponzi scheme. 

Are you suspecting volume of sales to crash or prices to crash?  

I suspect we'll still see prices drop more and the impulse buyers will disappear, then I can start getting serious again. 

I suspect you didn't learn to drill teeth by reading about it and trying it on the neighborhood kids.

There are other ways to do direct mail that are successful (I suspect).

I suspect that the reason STR supply is down in urban areas is due to STR regulations and ridiculously high LTR monthly rents.Shortly before the pandemic hit, a lot of STR regulations went into effect in densely populated cities.