Tar Pit Milk Bar
From the Super Mario Wiki
After Yoshi becomes a member of the Dino Riders, Duke tells him to meet them at the bar while they get their hands on Mario and Luigi. A little later in the episode, when Mario and Luigi head inside the Tar Pit Milk Bar, they are greeted by the Dino Riders, only to get kidnapped by them. As Yoshi watches outside in the distance, the Dino Riders reveal that they were planning to sell the Mario Bros. to King Koopa. After hearing their plan, Yoshi rushes off to get Princess Toadstool to help save Mario and Luigi.