" 

 :I've changed it to ""The series is set in the West Wing of the White House—where the Oval Office and offices of presidential senior staff are located—during the...[etc.]"" Also, I don't think ""presidential senior staff"" is capitalized. It's not a proper noun. Generally speaking, we capitalize ""President"" when using it as a noun (but not always, e.g., ""Barack Obama was elected president"" is correct, I believe). But, we almost never capitalize it when using it as an adjective (e.g., ""presidential motorcade"", ""he spoke in a manner that was very presidential"", etc.); hence, we wouldn't capitalize ""presidential senior staff"".   "