SOUTH BRONX SIZZLE: Once a symbol of urban blight, the formerly burned out neighborhood is now a major draw for investors Keith Rubenstein, a founder of Somerset Partners, a private equity firm, is transforming an industrial section of the South Bronx waterfront into mixed-use residential towers Companies big and small are flooding into the once-troubled South Bronx at historic rates, an early sign that an area which long eluded gentrification may be getting its day in the spotlight. "The last housing boom ran out of gas before it reached the Bronx," said real estate appraiser Jonathan Miller of Miller Samuel.