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.

How could I best secure financing for the renos to get each unit up and income producing?

Personally I would pass but if you go forward I would do a lot of research on the group you are renting to and get a very large security deposit to cover damage. 

Leveraging our market connections, we identified the property’s potential and negotiated favorable terms directly with the seller, securing it at a highly competitive price.

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.

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.  

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

By negotiating a significant discount, buyers can secure great deals while meeting the seller's urgent need to close the sale.

I liked the tenant, school is starting back etc, I told them they could pay first month and security deposit and I would let them have the rest of August for free.

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