Qual é a diferença entre I'm going to work in this office. e I'm going to be working in this office. ?Podes indicar apenas respostas exemplo.

They basically mean the same thing and can be used interchangeably without a change in meaning.
But here is an example in the difference in the emphasis of the two sentences.
The slight difference is that “I’m going to work in this office” is a firmer statement and “I’m going to be working in this office” puts the emphasis on continuing action of working.
For example, if you are already sitting at a desk and working in the office and someone sees you and says,
“Oh, I didn’t know you were here.”
“Yes, I’m going to be working in this office.” emphasizes the continuing action of working. (Yes, I have been working here and will continue to work here.)
“Yes, I’m going to work in this office.” is a more definitive statement, which might be the reply if the work spaces have not been decided, but you have decided to pick this particular office. (This is the office I have chosen.)
Of course, the tone in which either statement is said can also change the nuance.
"I’m going to be working in this office!" (I have been working here and will continue to work here and that is that!)
Either sentence can be used here correctly. This is just to explain that native English speakers will naturally chose one form or the other (or use tone) to emphasize the nuance they want.
Hope that helps.