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ST. LOUIS — Tarlton Corp. has completed the renovation and expansion of the Stephen and Peter Sachs Museum at the Missouri Botanical Garden in St. Louis. The 7,000-square-foot museum is listed on the National Register of Historic Places. Tarlton expanded the main level for exhibits of artwork and other displays. A new staircase links the two floors. The addition houses new public restrooms, fire stairs and an elevator. Tarlton also restored the building’s original tile floor and stripped layers of paint from bookshelves. Insulated glass and a new HVAC system were installed. The museum and the garden opened in 1859.