Salt Lake City Public Library | |
 Old Hansen Planetarium in 2010 | |
  Location of 15 S State St in Utah  Old Hansen Planetarium (the United States) | |
| Location | 15 S State St, Salt Lake City, Utah |
|---|---|
| Coordinates | 40°46′7″N 111°53′13″W / 40.76861°N 111.88694°W |
| Built | 1904 |
| Architect | Hines & Lafarge; Frederick A. Hale |
| Architectural style | Beaux Arts |
| NRHP reference No. | 79002505[1] |
| Added to NRHP | August 7, 1979 |
The Old Hansen Planetarium is a three-story building located at 15 South State Street in Salt Lake City, Utah. It has served many functions throughout its history. Originally built in 1904 as the Salt Lake City Public Library, the building was renovated in 1965 to become the Hansen Planetarium. After the planetarium closed and was replaced by the Clark Planetarium in 2003, the building was remodeled into the O.C. Tanner Company Flagship jewelry store, which opened in 2009. The building was listed on the National Register of Historic Places in 1979.