Personally I think it is downright stupid to buy at a cap rate below the interest rate.

The U.S. housing bubble will burst.The only variables are how and when Housing Bubble #2 will burst.The incentive (lower mortgage rates) to commit fraud by claiming to be an owner-occupant rather than an investor has pushed mortgage fraud to levels that Federal Reserve researchers declare "rampant."

Heloc are generally variable rate loans.  

Also interest rates are pretty  much at historic norms.

You may not be able to cash flow in a house hack, it just reduce your comparative housing costs in the area.  

What advice do you have for researching rental vacancy rates for single family and duplex-style housing?

Hello Victoria, I usually do 5% vacancy, 5% maintenance and 5% capEx.As you said this will be dependent on how old the main components are and how old the house is.

@Jeff RocheleauDefinitely sucks, especially if you are in an area that is experiencing increase HOI or tax rates. 

For house 1 cash out refi is often a better option then a HELOC unless your rate is dirt cheap.

There are so many variables like location, down  payment, your credit, prepayment, DSCR score etc. but we are seeing rates in 7's right now, possibly buy down into hte 6's but the recent spike back up in the ten year spiked up, two weeks ago you could have gotten into the 6's.always happy to provide people term sheets to see where rates are at.