Data on rents and vacancy rates

[Kalen Jordan]

Is there a good data source on rents and vacancy rates through the 2007 crash? I know I've seen a few ad-hoc stories about for example rents increasing through crashes as people are forced to downsize, but I'm not sure I've come across a solid data source that would show this type of thing.

Especially if you could drill down into specific markets. Would be great for example to know when investing in a specific market that even if the housing market were to take a turn for the worse, rents and vacancy rates wouldn't be hit very hard.