I would talk to a number of residential, private, and commercial lenders.

I've managed to secure the loan for the new house without having to sell the old house first.

We discussed this in an earlier post.Obviously, if loans are being made without any provision in the Operating Agreement, it’s time to get in touch with your State Securities Protection Division - usually a part of the State Attorney General Consumer Protection Agency.

When my business partner and I were still flipping we bought a couple through Auction.com and we always used a private money lender to fund those and our other flips. 

It does sound to me that a lot of that work should have come out of the tenants security deposit 

That is what the security deposit is for and if need be, the small claims court system.

When I started, I  submitted great deals to a corporate cash buyer,  they went behind my back and secure the deals with the sellers, after the  contracts expired.

and the property had a private dwelling value appraisal much higher than the public property appraiser claims. 

having been around this bizz for decades now on the private lending side I will tell you many to most private lenders started in the mom and pop rental bizz tire of it and switch to be the bank.. and right now wih rates up there return would be quite handsome .. but you do need to use caution..

I also require additional security deposit and sometimes a guarantor if they were approved in this manner.I also agree that this situation sounds like a pattern not a one-time mistake or short term tough situation that caused this.