Selling the investment management division, which includes Neuberger Berman, may not be as easy as Lehman Brothers executives think, CNBC's Charlie Gasparino says. According to Gasparino, Lehman wants to sell a 70 percent stake in the division with an option to buy it back at a later date. The buyer would also would get the option to purchase a 20 percent stake in Lehman that could be cashed in when firm's stock price recovers.

But this proposal has not impressed many potential buyers, Gasparino reports, citing executives familiar with the situation.

Gasparino cites employee retention issues once the unit is sold as another big concern for any potential bidder. Some Neuberger Berman partners are already said to be unhappy with the way the situation is progressing.  

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