Specifics about the third phase, which initially was to involve renovations to older buildings, long remained undisclosed.[1] In November 2009, plans were made public that LACMA's director Michael Govan was working with Swiss architect and Pritzker Prize laureate Peter Zumthor on plans for rebuilding the eastern section of the campus, the Perreira Buildings between the two new Renzo Piano buildings and the tar pits.[2][30] Architecture firm Skidmore, Owings & Merrill collaborated with Zumthor on the building's design.[31] With an estimated cost of $650 million,[32] Zumthor's first proposal called for a horizontal building along Wilshire Boulevard.