After her pilgrimage to ‘Akka in 1900, Sarah Farmer, made the facilities at the disposal of the followers of the Faith which she had herself recently embraced. The center attracted many Baha’i speakers including some very famous like, Mirza Abu’l-Fadl in 1902. In 1912 Green Acre became specially blessed by the footsteps of 'Abdu'l-Bahá Who spent a week there and gave a number of talks. In one of them on August 17 He indicated that “In the future, God willing, Green Acre shall become a great center, the cause of the unity of the world of humanity, the cause of uniting hearts and binding together the East and the West. This is my hope. (Abdu'l-Baha, The Promulgation of Universal Peace, p. 264). It is reported that ‘Abdu’l-Baha further indicated that one day Green Acre would become the site of the first Baha'i University and the second Baha'i Temple in the United States. The room in which ‘Abdu’l-Baha stayed is reserved nowadays for prayers and meditation.
Green Acre was the site of America’s earliest conferences on racial unity. It was also at Green Acre that the first election of the National Spiritual Assembly of the Baha'is of the United States and Canada took place. On 12 August 1929, the NSA of US and Canada obtained legal title to the property. Green became the site for the first office of the National Spiritual Assembly and the residence of its secretary, Horace Holley.