The Royal Asiatic Society rented rooms at 73 Collier Street from 2005-2006 while alterations were made at the newly purchased 14 Stephenson Way property. Items from this rental are:

• Plan of the rooms to be rented, dated 24 June 2005.
• Letter from Mark Winkler, Beaumont & Co., to Alison Ohta, Royal Asiatic Society, to set out the proposed head of terms for occupation of the rooms at 73 Collier Street, dated 30 June 2005.
• Licence Agreement between Manchester Square Properties Ltd. and the Royal Asiatic Society regarding the rental of the rooms for the time period 14 July 2005-13 July 2006. Signed and dated 13 July 2005.
• Letter from Alison Ohta, Curator, Royal Asiatic Society, to The Manager, Lloyds TSB Bank, Baywater Branch, to agree payment to Manchester Square Properties Ltd., dated 13 July 2005.
• "List of Furniture to take to Collier Street" - inventory of furniture, undated.
• "Notification of Change of Address from Queen's Gardens to 73 Collier Street - 2 printed cards.

In 1973 the Royal Asiatic Society celebrated its Sesquicentenary (150 years). The archival material includes Planning committee administration; material connected with the various events held, exhibitions put on and publications produced in celebration of the occasion; and material concerned with fundraising for the Society.

Notifications, Agendas and Minutes of Meetings of the Sesquicentenary Planning Committee. Includes some signed minutes. The Sesquicentenary Committee was established to oversee the organisation of the celebrations. The first meeting was held on 27 November 1968. They continued to meet even after the Sesquicentenary to administer the funds and give a progress report. In the Minutes for 9 January 1975, it was noted that arrangements were approved for the dissolution of the Committee on 19 February 1975.

Administrative lists concerned with the organisation of the Sesquicentenary celebrations. These are:

• "Sesquicentenary Committee", 1972-1973
• "Sesquicentenary Celebrations 1973" - Committee, 1971, 1974/5
• "Synopsis" - sheet of plans and events
• "Social Occasions" - listing Dinner, Reception and Concert
• "Summary of Minutes Concerning Exhibitions"
• "Appeals" listing fund-raising ideas
• "1973 Tentative Calendar of Events"
• "Royal Asiatic Society" - listing items within the Collections
• "Sesquicentenary" - summarising the different components of the celebrations
• "Sesquicentenary Reception" - Proposed list of guests - 2 versions

Printed material to advertise the Royal Asiatic Society and list the Events for its Sesquicentenary Celebrations.

"The Royal Asiatic Society: Its activities and objectives" Pamphlet defining the Society's role and to encourage application for membership.

"Royal Asiatic Society 150th Anniversary Year, 1823-1973, Calendar of Events". List of events, some annotated with supplementary events and changes to the programme.

Material concerned with the Sesquicentenary Reception held on 19 February 1972 with Her Majesty the Queen and HRH The Duke of Edinburgh in attendance.

Organisational Lists and Letters for Sesquicentenary Reception. These are:

• "Reception - Monday 19th February 1973" - lists of guests at the Reception and duties of members of the Society in overseeing the event, 6 pieces, typed with annotations.
• "Press Arrangements - Miss Anne Hawkins" - arrangements and queries concerning the needs of the press, 1 piece, typed with handwritten annotations.
• "Programme & Time-table for the visit of Her Majesty the Queen & His Royal Highness the Duke of Edinburgh to the Royal Asiatic Society on Monday 19th February 1973", typed list.
• "The City of Westminster Civic Protocol" listing the protocol for functions at which the Lord Mayor and Lady Mayoress are attending. With this list is another sheet containing biographical details for the Lord Mayor and Lady Mayoress. Two pieces, printed.
• Official letter from A.D.H. Bivar, Director, concerning the Ballot for attendance at the Reception, typed with printed letterhead. With this are 2 copies of the ballot form, typed.
• Official letter from A.D.H. Bivar, Director, concerning arrangements for the Reception.
• "Notes for the Guidance of Fellows on the Occasion of the Visit of Her Majesty the Queen and His Royal Highness the Duke of Edinburgh to the Society on February 19th 1973 - typed, 1 piece.

Printed invitation from the President and Council of the Royal Asiatic Society to the Society's 150th Anniversary Reception and Exhibition. Five copies including one with Dr John Hansman as the invited guest, still in its original envelope.