http://economistsoutlook.blogs.realtor.org/2013/08/30/rising-rents-for-residential-properties/
Single Family homes: “strong” at 71. 
Townhouses: 51. 
Condominiums approaching 50.  
The survey was sent to a random sample of about 50,000 REALTORS®.
The Index is calculated as a weighted average of the responses, evaluated at 
0-Weak, 50-Moderate, and 100-Strong.
 
.png)