If it helps give context, Miku is more of a mascot for a text-to-voice project/software that can be used to program singing using her voice or other voices too. I think all the voices have mascots that they call vocaloids.
The videos are probably promoting songs where her voice is used.
If there is less demand for people leasing offices, the property valuation will drop. There’s also another school of arguments where people commuting drives business to the areas they commute through, but idk how much that argument still holds with the rise of online shopping.