The increase in apartment rents is the result of several economic factors made clear in this article from the Los Angeles Times:
Home prices are tumbling to fresh lows, but new data show the rental market is on an upswing, an early indicator that housing may be headed into recovery.
Rents are increasing because the foreclosure crisis has created a steady supply of renters in recent years, analysts said, and those people — with their tarnished credit records preventing them from quickly becoming homeowners again — need places to live.