Both of these charts are from the blog a serious professional analyst whom I trust. (Bill McBride) Of course no one is perfect, but he says the charts below (from his blog) show data from Fannie and Freddie so I am 100% certain they do.
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As you can see, in 2012, (basically the bottom of the 2008 crash) the serious delinquency rate for multifamily approached 0.3%. The current rate is 0.2% and rising. It is already much closer to the historic highwater mark than to normal levels.
I am not sure why he does not show earlier data. His blog is here: Fannie and Freddie Serious Delinquencies in May: Single Family Declined, Multi-Family Increased
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