The venue consortium, which was launched at International Confex in February, will now require all current and new members to have at least the AIM Entry Level accreditation.
It has also formed a board to ensure the venture continues to develop.
London City Selection chair and Barbican business development manager Samme Allen said: "If we are to promote the City of London as a leading events destination it is vital we back up our claims with credible qualifying criteria. In a decision taken by our new board and current members it was agreed that the AIM accreditation scheme is the most appropriate for our purposes."
MIA chief executive Jane Evans said: "Accreditation is vital for venues and destinations wishing to market themselves at the highest levels and AIM provides the perfect platform. Our standards ensure we can reward venues throughout their development, growth and improvements. It is very exciting to be working with a consortium such as London City Selection, which will also add further value to our newly formed Destination Group."
London City Selection new board will be chaired by Samme Allen and include:
Membership officers: Ed Bolling (Ironmongers Hall), Carol Anderson (The Mermaid)
Marketing officers: Diane Waldron (HAC), Jihane Mamouri (Crowne Plaza Shoreditch)
Events officers: Ros De Vekey (America Square), Aimee Luxton (The Brewery)
Finance officer: Anthony Hyde (Barbican)
Partnerships officer: Brendon Smith (Etc venues)