I have my own designs and after uploading them and sending them out for a few rounds of marketing I eventually received some un-deliverables and they were barely legible along with their being major defects during printing.

Glazing in walls, enclosures or fences containing or facing hot tubs, spas, whirlpools, saunas, steam rooms, bathtubs, showers and indoor or outdoor swimming pools where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface shall be considered to be a hazardous location.

I merely made mention of some of the challenges I faced, but those challenges cannot be overstated either.

Nobody knew interest rates were going to go  shoot up (and nobody knew we were going to face a global pandemic).

That's what you face.

Here's the problem: They are not a sustainable asset for most to own; they are difficult and costly assets to exit through a sale; if you achieve favorable refinances, you may be able to use those funds to buy other (hopefully better assets) but are now faced with operating highly leveraged bad assets. 

First you have to face the local municipalities & will be extremely difficult to get the zoning approved. 

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

Does anyone here faced similar issue ?

I would think in most situations the original owner is in financial trouble, probably delinquent on their mortgage and facing foreclosure.