five-year expansion program. The next year, the exchange started considering relocation, even as it spent $2 million to expand its existing facilities. The AMEX considered moving to New Jersey, Connecticut, or Battery Park City, but its board of governors ultimately voted against these proposals. To encourage AMEX to stay in New York City, mayor Abraham Beame formed a task force to assist AMEX's expansion. The American Stock Exchange Building was designated a National Historic Landmark in 1978, and by extension was added to the National Register of Historic Places (NRHP). By 1980, AMEX had abandoned its plans to relocate and instead formed a committee to study ways to expand the existing structure. As such, a mezzanine in the trading room was announced in 1981, and completed the next year for $7 million, thereby expanding the trading floor's capacity by 35% to 40%. After AMEX's 1998 merger with the National Association of Securities Dealers (NASD), it was announced that the NASD would renovate the building as part of the association's relocation into nearby One Liberty Plaza. The NASD sold AMEX in 2004. In 2007, the building was designated as a contributing property to the Wall Street Historic District, a NRHP district. Redevelopment NYSE acquired AMEX in January 2008, and AMEX sold off their building. On December 1 of that year, the American Stock Exchange Building was closed, and both the Amex Equities and Amex Options trading floors were moved to the NYSE Trading floor at 11 Wall Street. In 2011, the American Stock Exchange Building and the neighboring Western Electric building at 22 Thames Street were purchased by the partnership of Michael Steinhardt and Allan Fried at a cost of $65 million, a quarter of which was spent on the AMEX building. The partnership announced plans to renovate the Greenwich Street building into a retail structure with a hotel, and destroy 22 Thames Street, raising concerns from preservationists and neighborhood residents. The New York City Landmarks Preservation Commission subsequently designated the building as a city landmark in June 2012. That October, Fisher Brothers bought the 22 Thames Street lot, leaving Steinhardt and Fried with the former AMEX building. In 2015, Clarion Partners purchased a 70% stake in the Curb Exchange building from Fried's company GHC Development. The old Stock Exchange building was used in November 2017 for an exhibit about the history of fashion house Louis Vuitton. The exhibit's success, as