Many of the properties owned by the Baha’i World Centre in Haifa and Akka were acquired from the Israeli government

Jewish militants in Haifa

Battle of Haifa (1948)

The Battle of Haifa, called by the Jewish forces Operation Bi'ur Hametz (Hebrew: מבצע ביעור חמץ "Passover Cleaning"), was a Haganah operation carried out on 21–22 April 1948 and a major event in the final stages of the civil war in Palestine, leading up to the 1948 Arab-Israeli War. The objective of the operation was the capture of the Arab neighborhoods of Haifa. The operation formed part of the 1948 Palestinian expulsion and flight, with approximately 15,000 Arab residents being displaced between April 21-22,^[2] and with only 4,000 remaining in the city by mid-May from a pre-conflict population of approximately 65,000.

https://en.wikipedia.org/wiki/Battle_of_Haifa_%281948%29

Many of the properties owned by the Baha’i World Centre in Haifa and Akka were acquired from the Israeli government, “made possible by the precipitate flight of the former Arab owners.”

On November 12, 1952, a cablegram sent by Shoghi Effendi announced the "acquisition of vitally-needed property" of the Mansion of Bahji and the area around it from "the Development Authority of the State of Israel...The exchange of said property, including land and houses, was made possible by the precipitate flight of the former Arab owners."

Acquisition of Vitally-Needed Property

Announce to Bahá'í communities, East and West, on the joyous occasion of the hundred and thirty-fifth Anniversary of Bahá'u'lláh's Birthday, the successful termination of the protracted negotiations, initiated two years ago and culminating in the signature to the contract providing the eventual, formal transfer by the Development Authority of the State of Israel to the Palestine Branch of the American National Spiritual Assembly of the extensive, long-desired, vitally-needed property surrounding and safeguarding for posterity the Most Holy Tomb of the Founder of the Faith, as well as the adjoining Mansion.

The acquired area, raising Bahá'í holdings on the holy plain of &Akka from four thousand to one hundred and fifty-five thousand square meters, was exchanged against property donated by children of Zikrullah, grandchildren of Mírzá Muhammad Quli, Bahá'u'lláh's faithful half-brother and companion in exile.

This spontaneous offer contrasts with the shameful action of the family in the sale to non-Baha'is of the property in the neighborhood of the Jordan valley purchased through the instrumentality of `Abdu'l-Bahá during Bahá'u'lláh's lifetime, pursuant to His instructions and alluded to in His writings.

The forty acre property acquired in this single transaction almost equals the entire Bahá'í international endowments purchased in the course of sixty years in the vicinity of the Báb's Sepulcher on the slope of Mount Carmel.

The exchange of said property, including land and houses, was made possible by the precipitate flight of the former Arab owners, traditional supporters of the old Covenant-breakers and descendants of the notorious enemy of `Abdu'l-Bahá who placed his residence at the disposal of the Committee of Investigation.

The signature to the agreement signalized the commencement of large-scale landscaping, aiming at the beautification of the immediate precincts of the holiest spot in the entire Bahá'í world, itself the prelude to the eventual erection, as happened in the case of the Báb's Sepulcher, of a befitting Mausoleum enshrining the precious Dust of the Most Great Name.

Desire to acknowledge the indefatigable efforts exerted by both Larry Hautz and Leroy Ioas enabling the consummation of the initial stage of the enterprise destined to eclipse in its final phase the splendor and magnificence of the Báb's resting-place on Mount Carmel.

--Shoghi

[Cablegram, November 12, 1952]