Forbes notes that Lehman Brothers has $24 billion of residential mortgages and another $29.4 billion of commercial mortgages on its books. There has been talk that Lehman will sell its commercial portfolio before that market tanks, which might be soon. Valuations are already starting to dip. If it were to sell the whole portfolio, Lehman could be looking at a mark-to-market loss of up to $4.9 billion, Sanford Bernstein estimates; any losses over $1.5 billion would require another capital raise. The extra capital needed would be between $500 million and $1.9 billion. So some think this would make the sale of Neuberger & Berman and other assets seem logical. We'll see. It could embark on an offering of some sort. There's no doubt that Lehman will find its way through this capital crisis. But it will emerge a smaller company that will strike many as a niche player at most.  

For more:
- here's the Forbes article