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The Immortals also known as the Persian Immortals was the name given by Herodotus to an elite heavily-armed infantry unit of 10,000 soldiers in the army of the Achaemenid Empire. This force performed the dual roles of both Imperial Guard and standing army. Wikipedia
Because "they hope to stimulate more business for downtown restaurants, bars, and hotels".
A central business district (CBD) is the business and commercial focal point of a city. In bigger urban communities, it is frequently synonymous with the city's "monetary area". Topographically, it regularly agrees with the "downtown area" or "downtown", yet the two ideas are partitioned: numerous urban areas have a focal business locale found far from its business or social downtown area or downtown.
