The civil non-profit Company for the Opera Building and the 'Maria Callas' Opera Academy was set up on 31 July 2000, and consisted initially of 30 partners, who were also the Company's founder members. Athens is nominated as the registered headquarters of the Company, and its offices are situated at 21 Lykavettou St, Kolonaki.

The Company consists, apart from the 30 founder members, of 150 Partners and Friends, who constitute the Body of Regular Members.

At the same time, the endeavours of the Society are supported by Senior Academic Institutions, the Association of Greek Composers, the National Music Council, and leading Greek soloists.

In addition, the Company has collected more than 6,500 signatures of those who support the efforts of the Company in aid of the Opera Building and the 'Maria Callas' Opera Academy.