It was named after Saint Petersburg, Russia, where Peter Demens had spent half of his youth. A local legend says that John C. Williams and Peter Demens flipped a coin to see who would have the honor of naming the city. Peter Demens won and named the city after his home, while John C. Williams named the first hotel after his birthplace, Detroit [[a hotel built by Demens). The Detroit Hotel still exists downtown, but has been turned into a condominium. The oldest running hotels are the historic Pier Hotel, built in 1921, formally Hotel Cordova and The Heritage Hotel, built in 1926.
from wikipedia[