Sadly though this week at a time when the BBC is under more pressure than ever to prove it's value to the politicians it didn't really justify it's position. In the past a separate studio for the election coverage was a no-brainer but I think with the improved spaces at Broadcasting House actually this time around they could probably have been accomodated there. Wouldn't have been as visually interesting at all and we'd all have complained about it, but Jeremy Vine (or Emily) could have been housed in their virtual studio with David Dimbleby at the desk and Andrew Neil in the soft area in the Newsnight studio (or equivalent).
Usually the final product justifies the large election studio, and of course I suspect much more goes on there than we see on screen, but this year it just felt like they were there for the sake of it.
*Disclaimer - post below contains a lot of uninformed speculating*
Picking up on this comment/thought I'm guessing there must be practical reasons for using a separate studio instead of parts of Broadcasting House.
I guess theoretically the preferred studio at broadcasting house would be studio B. Glancing at the schedule there was no Newsnight on election night, and no Victoria Derbyshire the following morning. It would mean World News staying in C for the following afternoon or using A or E. Theoretically for an interview area they could use the One Show's studio, especially if they plan to use the piazza again for the map & building projections.
I imagine in the next 5 years AR technology will become powerful enough for them to potentially do away with having a green screen area. It was noticeable how this time touch-screen technology was used a lot more this year, both on the night and from the weather presentation area (studio K?). I wonder if the green screen is now being used more for historical reasons than because it's the most practical method, compared to during the 90s and 00s. Personally I quite liked the (network) referendum coverage from Pacific Quay which kept it relatively simple and made use of the building.