Every day the Beastie Boy known as MCA, who spent years rapping about girls and parties and the five boroughs, goes to work in an office. Sure, it’s a cool one: the former headquarters of the Benjamin Moore paint company, it is a loftlike space filled with surfboards, skateboards, flea market paintings and his fellow Beastie Mike D.’s records; the attitude is dot-com casual. In this atmosphere of dudes, MCA has become the Boss.

Of course, it’s been a long time since MCA, born Adam Yauch, was known only as a hip-hop artist. In the 1990s he and his band mates founded an indie record label, Grand Royal, and a related magazine; both eventually folded. Under the name Nathanial Hörnblowér, he has directed many of the Beastie Boys’ music videos and their 2006 concert film, which was shot by fans. This year, under his own name, he released “Gunnin’ for That #1 Spot,” a documentary about high school basketball players.

Now, despite some formidable odds, he is pursuing his cinematic interests with a new division of his company, Oscilloscope, which acquires, produces and distributes independent movies.

Its next release, “Flow,” a documentary about global water problems, opens Friday. Also on the schedule is “Wendy and Lucy,” a Cannes favorite starring Michelle Williams that will screen at the New York Film Festival on Sept. 27 and 28 and is scheduled to open Dec. 10.