Sony wisely merged Columbia's heritage with MGMs. The result is sort of a mish-mash if you're looking for vestiges of the original MGM. Here is the "Capra Building," named for Director Frank Capra who helped put Columbia on the map.
And here's a shot including old MGM dressing rooms and offices, not far from the original studio commissary, where actors, management and stage hands ate together. One of the actresses under contract to MGM, Marion Davies, had a special dressing room designed just for her (and paid for by her significant other, William Randolph Hearst). When she left MGM, she had the dressing room moved to Santa Monica Canyon, not too far from 7th and Montana, where it's still used as a house. It was up for sale last year for about $2 million, as I recall. As for the MGM studio itself, the company which once practically owned Culver City, what's left of it sits in a nondescript office tower in Century City, a cautionary tale for any business which fails to change with the times.