As of my latest information cutoff in 2023, there has been no publicly reported seismic upgrade work specifically done on the Lion House at Temple Square in Salt Lake City, Utah. The Lion House is primarily a historic residence and a popular site for guided tours, distinguished by its distinctive lion statues guarding the entrance.

Current Use and Status of the Lion House:
The Lion House is open to the public for tours and functions as a historic site showcasing early Salt Lake City pioneer life and the history of the Church of Jesus Christ of Latter-day Saints. It often hosts special events, weddings, and Utah Heritage Foundation programs, serving as a cultural and historical landmark.

Original Purpose of the Lion House:
The Lion House was originally built between 1849 and 1856 as the home and hospitality house for Brigham Young and other church leaders. It was intended to serve as a residence and a place to host guests and visitors. Its large kitchen and dining areas made it a central hub for providing hospitality for those coming to Salt Lake City during pioneering times.

Summary:

• No public record of seismic upgrades specifically on the Lion House as of now.
• The Lion House remains open for guided tours and events.
• It was originally built as a residence and hospitality house for Brigham Young, and today acts as a historic site and cultural venue.

If there have been any recent developments beyond 2023 regarding seismic work on the Lion House, I recommend checking with the official Church of Jesus Christ of Latter-day Saints or Temple Square resources for the latest updates.