In 1977 Mrs. Mary Zimbalist commissioned a large extension of Pine Cottage, designed by the L.A. architect Charles Moore. She also had the so-called Annex, built in the late 1940s by J. R. Davidson, renovated and expanded. Being right across from Pine Cottage, it functioned as guest quarters, office and archive vault until the construction of the new Archive Building, completed in 2000. Currently, the Annex is part of the Pepper Tree Retreat and consists of four guest apartments, while the Archive Building served as the Library for about nine years, while AV began to be used as a guesthouse, named The Krishnamurti Retreat, a simpler version of the current PTR.
Over the years, many changes occurred. Most significant were the passing of J. Krishnamurti in 1986 and that of Mrs. Zimbalist in 2008. Both of them had determined that after their deaths, Pine Cottage (as it was still called, although the pine trees were long gone) was to be used as the Krishnamurti Library and Study Center, and nobody was to reside there. Less than a year after her passing, AV was radically renovated and spruced up, and designated ‘The Pepper Tree Retreat’ and offered to the public at large as a guesthouse with ten units.
In 2014 another structure was constructed to allow certain events, like yoga workshops, to occur on the property. It is a one-room circular structure called the Event Pavilion, right next to the new medicinal herb garden.