Lots of pent up demand in the market.

Developers see a boom for pent up demand because nobody was building when the market was frozen.

Pent up demand meets tightening inventory.

Calgary may need to slide further into its cycle before the timing is right to flip, or pick-up right-priced rental properties.TO is just expensive overall and is harbouring a pent-up glut of condominiums which, if unleashed, could make for a bumpy ride.

Factor in emotion and pent up demand/ frustration, and the possibility of loose lending in the future.  

Depending on what your gain situation is it may be worth your while to forgo the exchange on one or both in order to achieve what you want.But, if finding the right replacement property seems to be more difficult than selling your old properties and depending on your pent up tax liability it may be worth your while to consider doing a reverse exchange.  

It's also important to note that home ownership is currently at 20 year lows in the U.S. and eventually all of the pent up demand from the Millenial generation will boil over and cause another upswing in the single family market. 

Pent-up demand led to a brief surge to 62 starts in 2010, but that quickly subsided.

That to me indicates a huge level of unsatisfied pent-up demand. 

You can charge pent rent or a non-refundable deposit for pets so that way if there is damage you would have extra cash - up to you!