Nobody knows exactly who built this estate, but the accepted story was that in the aftermath of the American Civil War, a rather prominent gentleman arrived in the then-known Town of Canterlot and settled in the wooded hills surrounding the town, with the intent to start a new life there. The man claimed to be of a prestigious heritage and supposedly held a great fortune. Having risen among the ranks of High Society and was a prominent citizen among the wealthy elite. He was also an influence and advocator of the Spiritualist and esoteric movements at the time.
The Manor was constructed at around 1877. Details are not clear on who the architect's identity was, though it's rumoured to be the long lost creation of a famous local architect known "T Square", also known as Marianne LaRue. The mansion's most recognizable feature is it's two towers. one being a clocktower and the other being the Master's residence and place of work.
What happened next in the later years is not well known but what was known as that several parties and events were held at the manor house and that the owner of the house had mysteriously disappeared from public record during the 1930's and that the house hasn't been occupied since the great depression.
This is supposed to be based on a personal premise where an equestrian sorcerer/conjurer enters the human world in the 19th century (1830's) with the intent of starting a new life in that world. Believing his chances of success are better there than in Equestria. He takes on the identity of a well-rounded, well-cultured renaissance man with a prestigious background and quickly rising to the top of society in that time and using his knowledge and powers to amaze and entertain his fellow elite and to procure a great fortune, becoming a well known and influential millionaire and socialite (and to some extent a Playboy). Some of his wealth going into funds or donations for the construction of buildings such as Canterlot High and Crystal prep academy. This Equestrian sorcerer, as a Human, was also one of the people who helped start and influence the spiritualist and esoteric (occultist) movements in the 19th century and early 20th century as an attempt to bring equestrian magic into the Human world his way. Others tried to copy him but since they didn't hold magic like he did, these copycats wound up being exposed as frauds and fakes.
At around the great depression (1930's), he disappears from public record in later years but the legacy he leaves behind comes in the form of several buildings (including his own mansion) and infrastructure scattered across the city of Canterlot that he designed and built specifically to channel equestrian magic to fulfill specific but unknown roles, uses and purposes. Often either carving intricate patterns, symbols or runes into the timbers, masonry and steel or using materials found only in equestria and not native to the human world to build the structures. Something akin to how Ivo Shandor from the Ghostbusters franchise constructed 55 Central park west and renovated several new york buildings in the Videogame to channel spiritual energy.
The mansion is also meant to be a sort of contemporary take on a Wizard's tower based on the design and thee fact that the sorcerer lives and works in one of the Towers. It's also meant to convey the eccentric and somewhat antisocial personality of the Sorcerer.
The history of this house is left intentionally fragmented and vague so that it's left to the reader and viewer's imagination and to add to the feeling that whatever secrets that need to found are deep inside the mansion or buried deep in the Historical archives.
if you want to know where the estate would be located, it would be located in that wooded area near the movie studio and is probably tall enough to be seen over the treeline.
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