I have my property listed on websites and have received applications (with background/credit checks), along with many requests to view the property.

Credit score below 500. 

Borrowing against it is hard due to credit challenges.

You can not invest wisely without cash and cash reserves.Almost forgot....make sure your credit score is high, 750 or better.You need cash for a DP, closing costs and a reserve fund after you buy.

Probably due to bad credit but possibly a (maybe overextended) investor.2.

@Mitchell LitamThat's concealed grid product that was glued to drywall for sound control.  

Did a similar last year so intend to use the same products to finish.  

That question is hard, because there are so many different types of products. 

Only way this happens is if the note is private or held by a local credit union or local commercial bank ..if it rolled up in some large servicer one off buyers cannot or wont be able to do anything with it.

I have been offered 75% of the purchase price and 100% of the rehab, 80% of the ARV and 100% of the rehab but I have to have at least 15% of the loan and 3 months of payments in an account set aside for that deal, another one was $150,000.00 9.9% one time fee zero interest for up to 24 months on a revolving line of credit, and a few variations of these deals.