Actor Mark Wahlberg wasn’t monkeying around when he told David Letterman last summer that he was on the hunt for a new West Coast post. (He’s been living in Westwood.) The ”Planet of the Apes” star has settled on a 9,000-square-foot Mediterranean spread in L.A.’s posh 90210 hood — not far from Jack Nicholson. The two-story house sits behind gates on nearly an acre and a half with a pool and tennis court. Indoors, there’s a home theater, office, gym, and master suite with his and her bathrooms — one set up like a beauty salon. Perfect for re-creating Wahlberg’s rad ”Rock Star” coif!