Intro
As we all know, Rabwah was given to Ahmadis in some type of political deal involving Zafrullah Khan, the UK, the Khalifa and the UN.  It was signed to a 99 year-deal.  The details are given.  Also read this essay: https://ahmadiyyafactcheckblog.com/2017/10/15/pakistani-muslims-accused-the-govt-of-pakistan-in-1974-of-illegally-giving-rabwah-to-ahmadis/

Details of the rabwah deal
The land was leased by the Ahmadiyya Muslim Community following the migration of most of its members from Qadian and other parts of Indian Punjab, the old headquarters, to newly created Pakistan. 1034 Acres of land were leased originally from the government for PKR 12,000.[5] The lease was approved on 11 June 1948[6] The city was named Rabwah by then leader of the Ahmadiyya Muslim CommunityMirza Basheer-ud-Din Mahmood Ahmad.[7] Rabwah is an Arabicword (it also appears in the Quran) meaning an “elevated place”. The formal inauguration of the settlement took place on 20 September 1948 after prayers and sacrifice of five goats at the corners and centre of the area.[8] The ceremony was attended by 619 people[9] The place where Mirza Basheer-ud-Din Mahmood Ahmad led first ever prayers became the first ever mosque of Rabwah, the Yadgaar (literally Memorial) Mosque. The first settlements were in camps which were then replaced by buildings constructed of mud. The first ever building constructed using cement was the Mahmood Mosque.

  1.  Tareekh-e-Ahmadiyyat, Volume 11, Page 410. Edition 2007. Published by Nazarat Nashro Ishaat, Qadian, India. The ISBN printed in the document (181-7912-118-6) is invalid.
  2. Jump up^ Silsila Ahmadiyya by Dr Mirza Sultan Ahmad volume 2 edition 2008 page no 236
  3. Jump up^ “Hazrat Mirza Bashiruddin Mahmud Ahmad – Islam Ahmadiyya”. 22 February 2000. Retrieved 24 April 2017.
  4. Jump up^ Tareekh-e-Ahmadiyyat, Volume 11, Page 429-435. Edition 2007. Published by Nazarat Nashro Ishaat, Qadian, India. The ISBN printed in the document (181-7912-118-6) is invalid.
  5. Jump up^ Silsila Ahmadiyya by Dr Mirza Sultan Ahmad volume 2 edition 2008 page no 242