I’ve bought some houses with 0% interest for a year credit cards and a few with consumer lines of credit from banks.

At it's basic level:Assumption: Asking the bank to turn the loan over to you and going through the normal underwriting process, credit, income, DTI ratio etc SubTo: Taking over the loan without telling the bank, no underwriting, no credit check, no income verificationBoth have risks, but it's not my intent to be detailed in this post.

This is more common in today's market and often allows the seller to get a higher sale price than if you were to go through a bank/SBA loan.

The problem is, and here's where I really screwed up, is that now I'm told by lenders that because we have a commercial tenant banks won't refinance the property.

You went to work, made your money, and then enjoyed your life with your family.

With the exception of building a trailer on the property (these are hard to finance), this sounds like a good plan AND if you are using it for your business AND your business pays more than 50% of the rent (if you have more than 1 tenant), then this is a more financeable property in the eyes of banks and credit unions as it would be consider a commercial "owner-occupied" property. 

I would look FAR AND WIDE for someone to do an investment property HELOC -OR- go to a bunch of banks and CUs (including who you bank with now) to find someone to provide an unsecured (or secured if you have other collateral) LOC to get rid of the high int debt.

Do you think this issue is specific to banking services or what do you think is the root cause?

He is looking at a group of investors like myself to bring 25% of the project value and then procure a bank loan for the remaining 75%.

RentRedi’s syndication marketing helped us secure a great tenant in under four days, including employment and landlord verification, as well as criminal, credit, banking, and eviction history checks.