H. Gottesman Foundation gave $1.25 million in December 1981 for the restoration of the main exhibition room, which was redesigned by Davis Brody and Cavaglieri. Workers erected a temporary construction fence around the library's terraces in 1982. As part of a greater renovation of Bryant Park, Laurie Olin and Davis Brody redesigned the terraces, while Hugh Hardy redesigned the kiosks within the terraces. Several rooms were restored as part of the plan. The first space to be renovated, the periodical room, was completed in 1983 with a $20 million gift from Reader's Digest editor DeWitt Wallace. The exhibition room reopened in May 1984 and was renamed the Gottesman Exhibition Hall. The Catalog Room was restored starting in 1983. Ten million catalog cards, many of which were tattered, were replaced with photocopies that had been created over six years at a cost of $3.3 million. In addition, room 80 was renovated into a lecture hall called the Celeste Bartos Forum in 1987. Offices were relocated to former storage rooms on the ground level. Other divisions were added to the Main Branch during the 1980s, such as the Pforzheimer Collection of Shelley and His Circle in 1986, and the Wallach Division of Art, Prints and Photographs in 1987. The terraces on Fifth Avenue reopened in 1988 after they were restored. Meanwhile, the library was adding 150,000 volumes to its collections annually, which could not fit within the stacks of the existing building. In the late 1980s, the New York Public Library decided to expand the Main Branch's stacks to the west, underneath Bryant Park. The project was originally estimated to cost $21.6 million and would be the largest expansion project in the Main Branch's history. It was approved by the city's Art Commission in January 1987, and construction on the stacks started in July 1988. The expansion required that Bryant Park be closed to the public and then excavated, but because the park had grown dilapidated over the years, the stack-expansion project was seen as an opportunity to rebuild the park. The library added more than of storage space and of bookshelves under Bryant Park, doubling the length of the stacks in the Main Branch. The space could accommodate 3.2 million books and a half-million reels of microfilm. The new stacks were connected to the Main Branch via a tunnel measuring or long. Once the underground facilities were completed, Bryant Park was