In many major cities around the world today, historic buildings are gradually being replaced by modern high-rises and commercial complexes in response to the pressures of population growth and urban expansion. However, others argue that preserving these old structures, which carry cultural memory, is far more important than meeting the immediate needs of contemporary life. In your view, should the future of cities prioritize the development of new buildings or the preservation of old ones? Provide your reasons and cite specific examples to support your stance.