A little known San Francisco-based company is proposing a sweeping, 1.3 million-square-foot development on Harrison Street in the South of Market area. As first reported in today’s San Francisco Business Times, Cresleigh Development is proposing to construct three towers on the south side of Harrison Street between Second and Third. The application calls for a 478,000-square-foot office building, a 406,000-square-foot residential tower and a 300-room hotel along the south side of Harrison. Restaurants…