UPDATE: 9/10/13, 10:30 a.m. EDT. The names of the full team from Proskauer advising Ares and the CPPIB have been added to the 15th paragraph of this story.

The leveraged buyout boom of the last decade saw many an Am Law 100 firm cash in by snagging high-profile private equity clients. Now one of the companies caught up in that dealmaking frenzy, luxury retail chain Neiman Marcus, is set to be sold once again.