There's a lot of variables up in the air. 

Those numbers sound pretty accurate on a multi family you maybe able to get something in the high 5's to low 6's at best but that depends on a few variables of course 

Like it's been said, you left out a lot of variables. 

They are very useful and help me see other variables to analyze besides the numbers.

I have some of that, too.Commercial and seller financed loans (Like Frank's early on) have balloons, calls, variable rates and can bother you for your financials every year. 

Agreed, alot of variables jumbling around. 

Although the repair fees as you mentioned may be less, there can be variable costs and more than anything the HOA and or Condo association fees eat at any chance of good cash flow.

It takes the edge off of trying to use the money/forcing a deal since I am not paying interest on it until I draw it.But there are a couple of different variables in your situation, you will technically have to pay another set of "closing costs" when you pay off your home, whoever gives you the heloc will have to appraise, underwrite, etc. 

That may very well equal 15% on an annual basis, but for me it helps to think about them separately as the 8% should be constant, but the second line will be variable. 

Property taxes are variable not locked 6.