Just make sure a house hack is in line with the lifestyle you want to live and will cash flow when you move out.

Could you go in more depth in regards to the FHA sustainability factor?

Now, just because you may be doing well and be biased for your area and investment properties, I'm interested to play devils advocate and hear why these factors may not sustain themselves and why they could.

DTI is not a factor with commercial lending.  

Thanks for all the information.If this is primary residence, your capital gain will be exempt under sec 121 if you meet the requirements.If not, debt is not factored in when determining your taxes.  

Economists credit a mix of factors including ultra-low mortgage rates, increasing demand for space, and an emerging home-buying demographic: millennials.

A couple of factors are at play.First, rents trail purchases because it's a less efficient market. 

People either want to keep their comfortable lifestyle, are in a transition phase, or just simply don't take action.

I'm not factoring in appreciation, equity, or 1031 exchanging into better properties, rent raises, or promotions at work, so it can go more quickly than that, especially if I can figure out ways to use OPM so I can scale more quickly.But, similarly, appreciation would mean that acquiring such houses would take longer, and that's assuming I can find properties that actually cashflow $300 after everything, including capital expenditures, repairs, etc.

What size is the multifamily, this could play a factor.