A new $900 million, 740-foot skyscraper is being proposed for Boston’s Financial District. If approved, the skyscraper would be the tallest building in the Financial District and the third tallest building in the city. Entrepreneur Steve Belkin is hoping to receive approval for the tower after failing to receive enough interest or funding for a 1,000-foot building at the same location in 2006. If built, the complex would include office and retail space, a 300-room hotel, and possibly condominiums on the upper floors. The tower would be one of a few skyscrapers built in the area since the 1980s.