It may soon be time for ABC Carpet & Home to roll out of its headquarters. The luxury carpet and rug purveyor is shopping around its property at 880-888 Broadway, an office-and-retail condominium that sources said could fetch upwards of $200 million, or over $2,600 per square foot. The high-end rug purveyor has owned and fully occupied the six-story, 76,400-square-foot building since 1981.