In honor of Sherman Hemsley, move on up and check out the East Side building where George Jefferson found his 'deluxe apartment in the sky'

If you want to explore the haunts of some of New York City’s most popular 1970s sitcom characters, then jump on the Lexington Avenue subway and head to the Upper East Side. 

The Retrologist recently visited the “Diff'rent Strokes” building at East 79th Street and Park Avenue, and I’ll be heading up Park Avenue to “The Odd Couple" apartment building in a …