O.C. Tanner Flagship RenovationSubmitted by Reaveley Engineers + Associates
The historic Salt Lake City Library, built in 1905, was converted to a planetarium in 1965 and many of the original architectural features were lost. After the planetarium closed, O.C. Tanner purchased the building for conversion into its new flagship retail store.

The renovation included a seismic upgrade of the historic building, restoration of the exterior stone cladding, historic woodwork, cast-iron columns, plaster walls and ceilings, and the steel roof trusses. The addition of a spiral staircase, a two-story glass wall, and new electrical and mechanical systems created a modern building suited for the O.C. Tanner Flagship store.

The first challenge of the complex project was demolition. All levels, interior columns and walls, and the entire east wall of the building were demolished. This left a building shell with 45-in., unbraced, unreinforced brick walls and stone cladding.

A temporary bracing system provided flexibility to progress on the project with minimal interruption. The bracing allowed demolition in two stages: interior floors and walls, and demolition of the east wall.

The contractor then constructed new shear walls and installed 40-ft beams connecting them, including a new load-transfer beam to permanently support the existing roof. This all proceeded concurrently with underpinning of existing footings and strengthening of the brick walls.

Salt Lake City

$25 million
Owner: O.C. Tanner
Contractor: Big-D Construction
Architect: MJSA Architecture
Engineers: Stantec Consulting, Reaveley Engineers + Associates, Heath Engineering Co.
Among the Subcontractors: Fisher Marantz Stone, TID Demolition, Wardell Brothers, LSI, Child Enterprises, Blue Star Steel, Fetzer Architectural Woodwork, Waterproofing West, Noorda Architectural Metals, Sure Commercial Flooring, Hadley Brothers, Fire Engineering, Alternative Mechanical, Hunt Electric

Start: Sept. 2007 Finish: Sept. 2009