Being a nutrition and fitness coach, your point below is the largest component that I have seen. 

I put the first, largest mortgage in under the loan option in the BP calculator.

Note it often is not a result of significant NOI change (excluding some markets where a lot of new units have been added). 3 recent studies show it is cheaper to rent than own in virtually all of the largest US markets.  

The Austin metro market is approaching that territory.Here are the full stats for Austin and the greater metro:On the rental front, a recent Redfin report placed Austin atop the list for the largest year-over-year decline in median rents among US metros:Appropriate rental pricing and high-quality marketing are vital to navigating the current leasing market effectively.

If you care to learn about the distinctions, read these posts:https://www.biggerpockets.com/forums/517/topics/1215989-expl...https://www.biggerpockets.com/forums/51-tax-legal-issues-con...2.

If you can't make a distinction, then you haven't defined your criteria well enough yet.

@Richard Benjamin Wilhite, @Bill B.makes some good points about loan terms and the strict identification rules for a 1031 exchange.I would add from a tax mitigation perspective that buying the largest property possible will give you the greatest amount of cost segregation possibility and at the lowest cost since it would be one study rather than several. 

I know because I consulted for one of the largest real estate crowdfunding platforms.

As an experiment I invested $30k each in the 10 REITs which had (according to average estimate of NAV) the largest discounts from net asset value as per market price).

We're talking trillions of dollars stolen from Americans by 5 of the largest banks.