I just posted the address in the News forum where you also asked that question. It's listed in the site FAQ, and is:
Malpaso Productions, Warner Bros.
4000 Warner Blvd,
Burbank CA, 91505
You can find out about the history of Malpaso in Richard Schickel's biography, Clint Eastwood
. It was founded at the time he was preparing to shoot Hang 'em High,
in 1967. From p. 186:
Clint, acting on [Irving] Leonard's [his business manager's] advice, established his own company, Malpaso, which means "bad step" in Spanish and is also the name of a creek that ran through the property he owned in Carmel at the time. Clint liked the irony implicit in the phrase, but he says that he did not then foresee the company becoming the full-scale production entity that it soon turned into. Rather he and Leonard saw it as a typical loan-out company of the kind the movies' above-the-line talent had begun establishing in the 1950s, partly for their tax advantages, partly because they put their owners in at least nominal charge of their own destinies.
This soon changed. From p. 221, describing a decision Eastwood came to after the fiasco of the Paint Your Wagon
As the muddle persisted right up to the very last days on location, [Eastwood] firmly resolved never again to place himself in such circumstances. "That's when I came to the conclusion, after the fifth month, that I was going to be really active with Malpaso. I was going to go back to doing just regular movies."
From that point on, he was in effect his own producer, though he didn't take a credit in this capacity until Firefox
, in 1982; I'm not sure why.