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I'm sure it would be Он в ресторане на улице Пушкина

No.

It would be
в ресторане на улице Тверского, but that would be if Тверский was named after a man with that the name Тверский. The restaurant on the street of Tverskiy.
But Тверский is the...

No.

It would be
в ресторане на улице Тверского, but that would be if Тверский was named after a man with that the name Тверский. The restaurant on the street of Tverskiy.
But Тверский is the...