At the end of the day its real estate, the photos will go on the web or a few brochures and then never used again, it doesn't need to be 100% perfect.

If on the other hand you were doing actual architectural photography for a magazine, book or architect then you'd have to be worried about correcting perspective etc.. and a TSE would then become mandatory.

The tog we use at work only really uses his 17mm TSE, he uses a telephoto every now and then to flatten perspective or pick out key details but I'd say 90% of his work is with the TSE looking at all the EXIF info of the proofs he sends.