Mt. Agency is Mt. Lady's hero office, planted in the middle of a crowded city for the publicity even though her giant form barely fits there. She has already flattened the building once by accident and had to put it back up.
The office belongs to Yu Takeyama, the Pro Hero Mt. Lady. It is a multi-story building with a sign bearing the agency name across the front, and two horn-like shapes rise from its roof, echoing the horns on her domino mask. It debuts in Chapter 6.5 and Episode 27.
Placement was a calculated risk, and Takeyama knew it. Gigantification is awkward to use among tightly packed buildings, and a location out in the suburbs would have suited her Quirk far better. She chose the urban core anyway, against her own better judgment, because attention is the point and her career runs on it.
The choice has already cost her once. She managed to demolish her own headquarters by accident and had to rebuild the thing from scratch.

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Mt. Lady works for Mt. Agency, her own hero office headed by Yu Takeyama, marked by a pair of rooftop horn shapes that echo the horns on her domino mask.
Yes, Mt. Lady runs her own hero office called Mt. Agency, a multi-story building bearing her agency's name that first appears in Chapter 6.5 and Episode 27.
Mt. Lady chose an urban location for Mt. Agency against her own better judgment, since her Gigantification Quirk is awkward to use among tightly packed buildings, but she prioritized the attention a city center brings because her career depends on it.
Yes, Mt. Lady accidentally demolished her own Mt. Agency headquarters once and had to rebuild it from scratch.
Minoru Mineta interned at Mt. Agency under the hero name Grape Juice before moving on from Yu Takeyama's office.
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