If one is on the rise and the other on the decline you could end up owning a lot with a shell on it plus very high back taxes and City fines.  

Rents rarely decline at massive rates, even when property values plunge.

Flipping returns have declined nationwide over the past few years. 

Considering decades of decline in US manufacturing, this doesn't seem to bode well for future growth.Thomas S. puts it more bluntly than I have, but he's right.

U.S. home price forecast from Fitch Ratings.Fitch expects that California will lead the way with an additional 36% decline in home prices from current levels over the next 12 to 18 months.

In this town, prices have continued to decline each month and by the time I sold the property, it was worth less than when I had bought it.2.

The 2nd tied me up for 6 months in as many hidden leins, before they declined the offer and sent it to the auction.

Remember, most if not all NNN deals are valued based on the future cash flows, which means that the underlying value of the real estate may change (decline) over time as the term of the lease shortens.

This does not bring you into compliance if you decline for credit reasons.

It has just started it's decline, whereas, residential is more at the bottom or end of the decline.