7. Additional Concord Mill Dam Company Properties

The Concord Mill Dam Company also owned Heywood's Block at 23-25 Main Street, which displays many Federal-style details including high parapet double chimneys. Other Mill Dam Company properties include 29 Main Street (similar in appearance to Heywood's Block) and 36-40 Main Street (possibly the oldest building on the Milldam). 

The company's most significant structure is undoubtedly the Concord Bank-Middlesex Mutual Insurance Company building at 46-48 Main Street, Concord's only commercial example of Greek Revival architecture. The identity of the building's designer is disputed, but recent scholarship points to Squire Rufus Hosmer of Stow, a director of both businesses. 

Documentation from around 1845 lists a number of Concord Mill Dam Company principals who acted as trustees of the bank and members of the Committee of Investment, including Nehemiah Ball, John Keyes, Daniel Shattuck, and Abel Moore. Attorney Nathan Brooks often performed legal services for the company, and the first meeting of the bank corporation was held in his office located in the building. John Stacy was an owner or tenant, and David Loring was an investor. 

The insurance company occupied the first floor and the bank (as well as Nathan Brooks's office) the second. Prior to the establishment of this bank, Concordians were forced to travel to Lowell or Newton to conduct banking business. The bank greatly impacted the appearance of the Milldam and was instrumental in elevating the town's economic and commercial profile.