123 Sesame Street is a 1998 Sesame Street storybook in the "Elmo's Neighborhood" series. Elmo visits the brownstone at 123 Sesame Street, looking for the lost black puppy. He rushes through Ernie and Bert's apartment, passing Ernie's drum set and Bert's paper clip collection. He sees the mess in Ernie's closet, and the neat row of saddle shows in Bert's. He stumbles into the bathroom while Ernie is taking a bath with Rubber Duckie. Outside the window, Elmo sees the pigeon Bernice and the Twiddlebugs playing in the window box. Then he spots the black puppy trotting down the street, and hurries after him.