I'm unsure if you would be able to combine both loans given that the HELOC is tied to a different property than the one you got traditional financing on.A work around is if you are able to purchase the new property with the HELOC at a significant enough discount, bring the property value up via renovations or additions, then refinance the property, pulling out enough money to repay the HELOC. 

If you used a loan to rehab your property and find yourself in a difficult position, doing a straight refi (just paying off the old mortgage) will be easier than trying to pay off the original loan and take additional cash out.

These are professionals with additional training and a stricter code of ethics.

With some additions, this would qualify for the OMG category, but I think they didn't have that category back then when it was on the market.

Additionally, the price point is still cheap enough to find the 1% rule and positive cash flow and there's amazing appreciation potential.

In addition to risk, there is also salary cost the teams leading the renovations, leasing, sales, etc, and if applicable an assignment fee to a wholesaler that you will also not find in any public records.

We wanted additional units to pay mortgage and have cash flow.

.- Value add - How much does it cost to build additional storage units?

They attract artists, creatives, and people who appreciate a vibrant urban lifestyle.Real Estate Appreciation (Historically): @Dan H. points this out with his bathroom addition.

These are professionals with additional training and a stricter code of ethics.