Ran across this old commercial from 1985 for a Hyatt Space Hotel...

[Ar-Pharazon]

We see the Regula One station again in TNG, but it was mainly just stock footage. The model itself wasn't newly filmed again until the latter half of DS9, and it was intact except for the bottom tubes.

I actually think this was a completely different model, built solely for the commercial (it was a Super Bowl ad, so they had the dough to build it.) Whoever built it definitely took design cues from Regula One, but did their own thing.

Like you say, "intact". That thing from the commercial could very well have been the same model with a missing part or two, what with the low res.

 

[Dukhat]

I’m pretty sure it’s not the same model. Granted the video quality isn’t very good, but you see closeups of the model and the tanks don’t look the same as the office complex tanks. They’re similar, but not the same.

I think whoever built this model took inspiration from the office complex/Regula One, but did his own thing.

 

[publiusr]

I hate to say it, but I kinda like it better. The shuttle bay of the office complex...didn’t look like a shuttle-bay, but something else...