ELIZABETH, N. J., April 13;- The Arcade building, the flnest in the city, located on Main thoroughfare and Broad street, 1 burning and there is every indication of the fire extending. The Arcade coat $150,000. The First National bank, postoffice, Tbird regiment headquarters, Conservatory of Music, district court and a number of offices and stores are located in tbe building. The fire was conüned to tho Arcade building. The loss is about $500,000. The fire spread so rapidly that some of the mail burned and also money in the bank that could not be got into the safe.