The memorandum will create a recognised framework for greater cooperation between the two bodies 'with the aim of facilitating closer coordination on matters of mutual interest and shared provision of members' services'.
As a result, the RIBA expects the agreement will create much closer ties with landscape architects and will help to meet its charter objective, to 'advance architecture'. For the Landscape Institute, the collaboration will further strengthen the position of landscape architecture within the built environment.
Both institutes hope the new partnership will also help to build 'an alliance of professional institutions in architecture, environment and design in order to better serve the professional needs of members, associated industries and thereby society'.
Speaking before the formal signing of the document on Tuesday, RIBA president George Ferguson said: 'This is an important agreement signifying a greater coming together of our disciplines and institutes for the benefit of clients, users and the general public.
'It chimes well with the current move to coordinate skills for the delivery of sustainable communities. There has been an artificial separation between our interdependent disciplines for too long.
'Both institutes have much to learn from each other and I look forward to us coming closer together as professional bodies and as fellow professionals,' he added.