Since the early 1990s, Rosenthal has brokered the sales ofhistoric properties in Los Angeles, many of which have beenrestored and revitalized as part of the redevelopment that hasoccurred in Downtown L.A. in recent years. At CB Richard Ellis, hefounded the firm's urban redevelopment group.

Among Rosenthal's noteworthy deals was his representation ofdeveloper Tom Gilmore in the year 2000 in assembling a majorhousing conversion in the downtown market: the Old Bank District.In 2004, he managed the sale of two of downtown's best-knownhistoric icons, the Eastern Columbia Building and the OviattBuilding.

Rosenthal, who joins Grubb & Ellis as a senior vicepresident, served as adviser in the creation of Downtown PropertyOwners, the first business improvement district in the State ofCalifornia. He currently serves as an adviser to several propertyowner BIDs, and he is also an elected adviser to the Los AngelesCity Redevelopment Agency.