As an AI language model, I don’t have access to the most up-to-date real estate market data. However, here are 10 cities and their corresponding regions that are known to be at the forefront of sustainable and energy-efficient infrastructure for transportation hubs:

1. Scandinavia (comprising of Norway, Sweden, Denmark, Iceland, and Finland)

2. Amsterdam, Netherlands

3. Berlin, Germany

4. London, UK

5. Copenhagen, Denmark

6. San Francisco Bay Area, United States

7. Vancouver, Canada

8. Barcelona, Spain

9. Tokyo, Japan

10. Singapore, Southeast Asia

These cities are known for incorporating innovative and sustainable practices in their transportation infrastructure, such as electric buses, trains, and subways, bike-sharing programs, green streets, and bike lanes. This trend is due to these cities’ initiatives towards renewable energy sources, reducing carbon emissions, and improving air quality.