Updated Northwestern buildings

[viennguyen2026]

Description

Added a few Northwestern buildings, and added a helpful source for finding more of those buildings.

Fixes # 74

Testing Instructions

No testing was done.

Checklist:

• [ ] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

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