Mezzanine funds are also investment pools, which traditionally focused on the mezzanine market only. Above were the mezzanine, main seating level and balcony. Two staircases from each platform lead to the upper mezzanine of the complex. The mezzanine and balcony features 1,000 seats each. The MTA also started installing escalators between the lower concourse and the platform mezzanine. A low mezzanine with offices divides the two floors. The 17th floor through the 27th-floor mezzanine contain hotel condominiums and executive lounges. The Main Concourse is connected to the subway platforms' mezzanine via the Shuttle Passage. By the 1970s mezzanine and balcony seating areas were closed to the public. The basic forms used in most mezzanine financings are subordinated notes and preferred stock. Further diversion is added by the circular and decorated windows of the second floor mezzanine. In addition to loans it also provides equity and mezzanine financing. The tower has 85 occupiable stories, which consist of a mezzanine and 84 numbered floors. The second mezzanine was similar to the first floor mezzanine. Developers could also elect to install an elevator between the mezzanine and the two platforms.