All have good attribute and bad so here we go. 

If debt-financed real estate is acquired via an IRA, any income attributable to such investment will generally be subject to unrelated debt finance income tax.5.

I am trying to figure out the important attributes to look for such as school district, proximity to freeway etcAlso, do let me if you have any tips on specific attractive zip codes or neighborhood.

"(5)Limitation on deductions In the case of a use described in paragraph (1), (2), or (4), and in the case of a use described in paragraph (3) where the dwelling unit is used by the taxpayer during the taxable year as a residence, the deductions allowed under this chapter for the taxable year by reason of being attributed to such use shall not exceed the excess of—(A)the gross income derived from such use for the taxable year, over" - Found itThank you for the advice, and referencing the relevant IRC sections.There isn't a lot of guidance, and I was using the guidance given from the biggerpockets blog to calculate those expense ratios - so seems to me there isn't great consensus or just a lack of knowledge on this issue in general.Blog link: https://www.biggerpockets.com/blog/2016-02-21-tax-implications-house-hacking"If you have a single family home, you can either divide the room you occupy by the total number of rooms (rooms include beds, baths, kitchen, living room, dining room, etc.) or the square footage you occupy by the total square footage.You will now have a percentage of the home that you occupy and a percentage of the home that you rent." 

In addition to what others have mentioned regarding a shift from fly away destinations to driving destinations, I attribute a large amount of the uptick to a reduction in inventory.  

How does one determine how much should be attributed to the rental unit?

If debt-financed real estate is acquired via an IRA, any income attributable to such investment will generally be subject to unrelated debt finance income tax.5.

However, I believe that you would be a great attribution to my successes and I am hopeful that I could be the same for you.

If debt-financed real estate is acquired via an IRA, any income attributable to such investment will generally be subject to unrelated debt finance income tax.5.

This area was (and may still be) a fantastic area, mostly owner occupied, with challenging cash flow attributes but easy to rent.