Create an elegant and professional homepage banner for an architectural association, featuring a blend of classic and modern architectural elements. Include iconic features such as columns, arches, and sleek glass facades. The backdrop should be a clear blue sky, reflecting innovation and excellence in architecture. Incorporate subtle nods to sustainability, like greenery or solar panels, and ensure the design conveys a sense of heritage and forward-thinking vision. The overall aesthetic should be clean, sophisticated, and fitting for a professional organization.