Melinda Jason and Gary Goldstein are joining forces as a producing team, while each will continue to maintain their respective, ongoing personal management businesses.The producing partners, who have moved into the same office space on Robertson Blvd., will, at least for the short term, consult on management matters with an eye toward merging that portion of their operations. Both have been managers for more than 10 years. Among Jason’s clients are “Rain Man” co-scripter Ron Bass, directors Patrick Johnson and Rob Weiss and writers Julie Talen and Seth Winston. Goldstein’s most high-profile client is “Pretty Woman” and “Under Seige” writer Jonathan Lawton. Jason executive produced Madonna starrer “Body of Evidence,” and two films with Interscope: “The First Power,” a horror movie for Orion release, scripted and directed by Bob Resnikoff, and the Gregory Hines vehicle “Eve of Destruction.” Goldstein has produced one film a year over the last five years, two of which were directed by Lawton: “Pizza Man,” which was released in 1991, and “Cannibal Women in the Avocado Jungle of Death,” released through Paramount Home Video three years earlier. Goldstein and Jason said under their new producing partnership, they are jointly developing two thrillers and a duo of romantic comedies in house. Independent of each other, the two will continue to have projects that predated the joint venture. Jason will produce and Lynn Pleschette will co-produce Andrew Niccols’ script “The Undressing of Sophie Deane” for MGM; “Turn On The Radio,” a comedy set up at Paramount by Charlie Bohl; and “Rules of Engagement,” a script by Frank Namei in development at Warner Bros. Jason is also attached to produce, with Oliver Stone and Janet Yang, “Killer,” written by and to mark the directorial debut of Tim Metcalfe (“Kalifornia”) about the relationship between a criminal and a Jewish prison guard in the early 1990s. Goldstein is also developing a number of projects, including “Unhook The Stars,” an independently financed movie to star Gena Rowlands, Laura San Giacomo , Martin Sheen and John Cusack and to be exec produced by Laura McCorkindale; “Fade,” a coming-of-age story adapted by Elisa Bell from Robert Cormier’s novel which is set up at MGM; “Kirina,” an action-adventure love story by Lawton to star Christopher Lambert that Goldstein will produce with John Davis.