The building at 46 Main Street in Concord was erected in 1832 for the Concord Bank (which later became the Concord National Bank) and the Middlesex Mutual Fire Insurance Company (incorporated in 1826), which occupied the first floor for many years. The Middlesex Institution for Savings was founded in 1835 and shared space with the Concord Bank on the second floor. Both institutions were robbed in a famous incident in 1865. By the 1880s, the insurance company had moved out of the first floor, part of which was then occupied by Frank Tuttle’s tailor shop. Starting in 1886, the post office was also located in the building for many years. When the bank vacated the second floor in 1894, Tuttle moved his tailoring business upstairs and continued there until his death in 1913, while the National and American Express companies had their offices on the first floor until 1914. Various office tenants and commercial businesses have occupied the building over the years.