BETAPLAN ARCHITECTS & PLANNERS Ventourakis - Tavaniotis & Associates S.A. Since the beginning the firm has had the chance to work for a diverse group of clients in both the Public and Private sector, ranging from Local Authorities to State Ministries and from small private investors to large institutions. Through BETAPLAN’s involvement in several of the major projects in Greece, like the Main Olympic Complex Venue of Santiago Calatrava, the New Acropolis Museum of Bernard Tschumi or the recently Stavros Niarchos Foundation Cultural Center of Renzo Piano Building Workshop, BETAPLAN, acting as the architect of records, has gained significant experience and is very familiar with the different permitting procedures depending on the type of the project.