St James?s Street, London, decorated for the Coronation of King Edward VII. Street Crowded with people and vehicles. Decorations on Lamp posts. Part of Box 247 Boswell Collection. St James's Street is the principal street in the district of St James's, central London, England. It runs from Piccadilly downhill to St James's Palace and Pall Mall. The main gatehouse of the palace is at the southern end of the road, and in the 17th century Clarendon House faced down the street across Piccadilly, located where Albemarle Street is now situated.