A law firm that once led Florida in foreclosures is shutting down amid an investigation into "robo-signing" and other questionable practices.

A Securities and Exchange Commission filing Monday indicated that David Stern's Plantation-based practice will end operations March 31. The firm once had more than 1,200 employees and handled tens of thousands of foreclosures each year.

Stern's firm is one of several under investigation by Florida's attorney general. The probe focuses on whether false or improper affidavits were filed in foreclosures and whether employees were robo-signers who signed documents without reading them.

A broader national probe is examining how foreclosures were handled during the economic downturn.