The New York investment bank will cut 1,200 positions in 23 locations as a result of the closing of BNC Mortgage. It will take an after-tax charge of $25 million and a goodwill write-down of $27 million, it said. Lehman said that poor market conditions in the mortgage space of late have "necessitated a substantial reduction in its resources and capacity in the subprime space," according to a release. The company said earlier this summer that it was combining its two non-prime residential mortgage businesses - Aurora Loan Services of Littleton, Colo., which specializes in Alt-A mortgages, and BNC Mortgage...