I don't know if this building has already been included in this thread, but it's one that I really like, and wish it was still around...sort of.
It was built by an outside organization in the 1880s with the intent that all of the thousands of wives and children fleeing 19th Century Mormon polygamy would have a place to stay--sort of a YWCA. They built it, they opened the doors, and not as many people came as expected. Over the course of seven years they served the needs of 150 wives and children total, which wasn't enough to maintain operations. They closed it up and eventually demolished it. Except I just found this excerpt that gives more information:
" Fifth East Hotel, May 7, 1928. This imposing Victorian structure at 145 South 500 East was built as the Women’s Industrial Christian Home. Completed in 1889, with funds appropriated by Congress, the Home was intended to provide a shelter for women and children, especially those escaping Mormon polygamy. Few took advantage of this haven and the Home soon closed. The government sold the building, which eventually became the Fifth East Hotel and later the Ambassador Athletic Club. The club closed its doors in 1985 and the building was subsequently razed. " Taken from Seeing Salt Lake City from Signature Books:
http://signaturebookslibrary.org/?p=19793
On 500 East between 100 and 200 South.
There was an article about it in UHQ: Gustive O. Larson, “An Industrial
Home for Polygamous Wives” Utah Historical Quarterly 38 (Summer 1970):
263-275.