City Hall Historic District (Boundary Increase)
The National Park Service has not published a boundary polygon for this district; the map shows the listed properties inside it and the district's reference point.
Why it's listed
Fronting Market Street in downtown Lowell, the Ayer-McCartin Block is a four-story brick commercial building fourteen bays wide. Its western ten bays were built around 1858 and its eastern four bays were added around 1867 with nearly identical details. The facade has granite and cast-iron storefronts, pressed red brick upper stories, arched windows with Italianate hoods and a projecting wooden cornice. Traces of brown paint or mastic on the window hoods show an early attempt to imitate brown sandstone. The building served as the laboratory of J. C. Ayer & Co., a patent medicine firm whose products, including Ayer's Cherry Pectoral and Ayer's Almanac, were sold worldwide. It was once linked by a bridge to the company's headquarters on Middle Street, which already lay inside the City Hall Historic District. The block was added to that district for its architecture and its commercial association with the Ayer company, and it was undergoing rehabilitation at the time of listing.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · catalog entry. Generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29).
| Period of significance | 1858-1938 |
|---|---|
| Styles | Renaissance Revival |
| Areas of significance | Commerce, Architecture |
| Acreage | 0.9 |
| Boundary source | not published |
| Full listing page | City Hall Historic District (Boundary Increase) (property record) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.