“With interest rates dropping and home price increases starting to ease, investors may be getting out while the getting is good, before the market softens further,” said Todd Teta, chief product officer at ATTOM Data Solutions.

For the most part, the way they soften up is by dropping the price. 

Even though we are technically long overdue for a correction, supply/demand and cost of new construction have not changed and it will take years to balance out and allow the housing market to soften.

The property prices have been softening and rents have been flat for years.  

(I own a good sice portfolio and we are leveraged with a very healthy equity share.)A stress test for your portfolio is basically a set of distressing circumstances, like a worst case scenario and then you look at your bottom line.What happens if:- you loose 30% of your tenants- rental rates soften- your competition starts giving out free rent- your adjustable rate financing kicks in- your annual capex spikes (well, this should not come as a surprise)- etcNow you don't look at this statically and say okay now I cam cash flow negative.

These might soften some of the restrictions as currently listed. :)

They're undervalued and due for an increase when the economy softens. 

That 15 to 20 percent you socked away will soften the blow when you find out you need new electrical wiring or mold remediation.

Especially if that price point softens, comps change, etc. 

No fussy features like marble countertops that stain easily or other house systems that require upkeep like water softener systems and similar.