generate questions: In the early part of the 20th century, Atlantic City went through a radical building boom. Many of the modest boarding houses that dotted the boardwalk were replaced with large hotels. Two of the city's most distinctive hotels were the Marlborough-Blenheim Hotel and the Traymore Hotel.
When did Atlantic City go through a radical building boom? {sep_token} What replaced many of the modest boarding houses? {sep_token} What were the names of two of the city's most distinctive hotels? {sep_token} What happened to Atlantic City in the early part of the 20th century? {sep_token} Where were the modest boarding houses located before they were replaced by large hotels? {sep_token}