Articles of the Federation and several other novels describe the location of the office of the President of the United Federation of Planets as being at the Place de la Concorde (specifically, in the Palais de la Concorde), in Paris. When this was first mentioned in the A Time To . . . series, I suggested that this location was probably incorrect given what we had seen on screen.
I used a series of diagrams to show that the silvery building we see in establishing shots of Paris couldn't be located at the Place de la Concord, but it was - quite rightly - pointed out to me that we needn't conclude that the silvery building housed the presidential office. I concede the point, and I put the issue out of my mind.
Today, while watching Homefront and Paradise Lost, I happened to notice the view out the window of Jaresh Inyo's office. It can be seen here:
A similar view can bee seen through Ra-ghoratreii's window in The Undiscovered Country:
The office cannot be located at the Place de la Concorde; it must be almost directly across the river from the Eiffel Tower, somewhat south of the Pont d'Iena, probably in the area I've circled below.
The most likely candidate in this circle is the Trocadero (also known as the Palais de Chaillot), which is where Diane Duane placed the President's office in the Rihannsu series (given the date of publication, I would guess she deduced the rough location of the office from its appearances in The Undiscovered Country and Deep Space Nine).
I'm not sufficiently skilled in practical trigonometry to say whether the identification of the Trocadero as the home of the Federation President's office is correct, but it is certainly located in that general area in The Undiscovered Country and Deep Space Nine, not at all near the Place de la Concorde, except so far as both are along the Siene in Paris.
I suppose it's possible that the Trocadero is used as something akin to Blair House in modern Washington, and that the Palais de la Concorde happened to be under renovation in both 2372 and 2293, which would allow the recent novels to be correct, unless I don't remember details within those that contradict the Trocadero having served as an office to the presidents in those years.
I used a series of diagrams to show that the silvery building we see in establishing shots of Paris couldn't be located at the Place de la Concord, but it was - quite rightly - pointed out to me that we needn't conclude that the silvery building housed the presidential office. I concede the point, and I put the issue out of my mind.
Today, while watching Homefront and Paradise Lost, I happened to notice the view out the window of Jaresh Inyo's office. It can be seen here:

A similar view can bee seen through Ra-ghoratreii's window in The Undiscovered Country:

The office cannot be located at the Place de la Concorde; it must be almost directly across the river from the Eiffel Tower, somewhat south of the Pont d'Iena, probably in the area I've circled below.

The most likely candidate in this circle is the Trocadero (also known as the Palais de Chaillot), which is where Diane Duane placed the President's office in the Rihannsu series (given the date of publication, I would guess she deduced the rough location of the office from its appearances in The Undiscovered Country and Deep Space Nine).
I'm not sufficiently skilled in practical trigonometry to say whether the identification of the Trocadero as the home of the Federation President's office is correct, but it is certainly located in that general area in The Undiscovered Country and Deep Space Nine, not at all near the Place de la Concorde, except so far as both are along the Siene in Paris.
I suppose it's possible that the Trocadero is used as something akin to Blair House in modern Washington, and that the Palais de la Concorde happened to be under renovation in both 2372 and 2293, which would allow the recent novels to be correct, unless I don't remember details within those that contradict the Trocadero having served as an office to the presidents in those years.
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