Andy- There are a couple of older books that might be helpful: Architectural Photography, John Veltri/Amphoto and one that I found helpful many years ago: Photographing Architecture and Interiors/Julius Shulman/Whitney Library of Design. Somewhere I recall hearing that the latter has been updated. Also, go to a library and look at what is being done in the architectural magazines such as Architectural Record (assuming they are still publishing). Hope this helps. By the way, a 90mm is an excellent choice for 4x5. Regards, Merg