What does Trump's recent "legacy project" involve?

Trump's recent "legacy project" focuses on the development of a $200 million ballroom, which is intricately tied to his brand image and business endeavors. This ballroom represents not just a physical space, but a strategic effort to enhance his portfolio in the hospitality industry, aiming to create a venue that aligns with his luxury brand while catering to high-profile events and gatherings. By investing in such a substantial project, it reflects his desire to leave an enduring mark and contribute to the landscape of venues available for public and corporate events.

The other options relate to different types of infrastructure and development projects but do not capture the essence of Trump's focus on creating a high-profile, branded space that would serve as a significant part of his legacy, unlike the ballroom initiative.