, Tracking Overall Drop in Commercial MBS Volume The securitization of multifamily mortgages declined significantly in 2000, as the overall commercial real-estate securitization market cooled for the second year in row. A new year-end market analysis by Inside MBS & ABS shows that $19.84 billion of multifamily mortgages were securitized last year, down 32.8 percent from the level in 1999 and off 38.3 percent from the volume back