I deeply apologize for overlooking your last two messages of Jan 3 until today.  I'm still new at this and I simply didn't see them, although I certainly should have.

Anyway, your pictures of the Richards building are great!  Some of them, such as the full-height shots of the western service tower and the two towers flanking the main entrance, aren't available anywhere else as far as I know. The porch photos certainly help to illustrate the Vierendeel trusses that support each floor.  This collection of photos will benefit anyone who is studying what is generally considered to be Kahn's breakthrough work.  If you don't mind, I might make minor changes to some of the descriptions.  In particular, you correctly identified the two types of shafts in the photo taken from the garden on the south side, so I would remove the question marks from that description.

If you ever get a chance to visit the Olivetti-Underwood Factory building near Harrisburg, that would be great, especially since that article doesn't have any photos at all.  I suspect, however, that the building will be difficult to photograph.  The standard books on Kahn's work usually include a shot of one of its 72 mushroom-shaped (more-or-less) structural units while it was under construction, one of the entire building taken at an angle from an airplane, and one of the old entrance that was apparently at the northeast corner.  The old entrance seems to have been closed, so from the ground on the outside, options today seem to be limited.  

It still might be possible, however, to take a photo that gives viewers a feel for the size and shape of one of those 72 mushroom units, which would be very helpful.  When I follow the link in that article to the aerial photo of the building, I see that those units might be most visible and accessible from the west side, so perhaps a meaningful photo could be taken of the mushroom unit in the northwest corner of the building.  You would want to emphasize the west side of that mushroom unit, which has an indentation separating it from the next unit to the south, which should help to visualize its shape.  The north side of that mushroom has a triangular protrusion between it and the next mushroom to the east, which I suspect would obscure its shape.  Frankly, I'm not sure how well this will work from the ground, but it is worth a try.  Depending on the light, it might work better to try a similar photo of the mushroom unit on the northeast side of the building, where I think the old entrance used to be, again de-emphasizing the protruding triangle on the east side if possible.

Also, perhaps there is a visitor's area in the entrance lobby where photos of the internal structure of that mushroom unit are permitted?

Good luck, and thanks again.