When we shot interiors with 4x5 film, I carried 8 lenses and used all of them. Nowadays I carry 4 lenses with my Rm3d. I also keep the 5d2 + 17mm TS-E on hand for extreme wide scenarios which are very rare. I carry an adapted Leica zoom which is nice for little details, too. I have another 3 (longer) lenses for the view camera that only come out on furniture shoots.
So, even though I actually have several lenses, as Joe suggested, I shoot about 80% of my work with just one (in my case the 43mm). When you have a high MP back, cropping in 15% or 20% is not an issue and allows bigger focal length gaps.
I don't find the Nikon particularly suitable for architecture. Mind you I actually prefer Nikons and really miss my D3... but you just don't don't have the tilt/shift capabilities. They have no 17mm and what lenses they do have constrain the tilt to a single axis. Lame. Canon's 17 & 24 with their independently rotating tilt and shift are far more useful and that 24 is one of the sharpest lenses I have ever seen.
Yada yada, etc, etc...