The entire district has a historic designation, and here is that buildings description from the overall district. Looks like it will require more digging, but my hunch is it was a tavern associated with the brewery. With AB being the big player in town and a lot of smaller breweries pre-prohibition there are numerous taverns with brewery ties:
3128 MORGAN FORD RD 1C/0NC
1922
Type/Use: Two-part commercial block
Roof shape: Complex
Structure: Brick
Roof material: Composition shingle
Stories: 2
Foundation:
The original corner building is a two-story brick structure with a rounded corner to the intersection of Morgan Ford and Hartford. The first floor is built out a wythe from the second story wall plane with a red brick veneer that squares the corner. A five-sided dormer faces the corner; its sides retain original slate. Other original features at the front building include copper guttering, second-story sill course and original windows. A single-story brick addition to the east has two doors with bracketed gabled hoods at individual stoops facing Hartford. Attached at the east end of the lot is a parged frame and brick garage (noted as a tin shop if this is the same building from the 1903 Sanborn). The middle section of the building is completely burned out except for the exterior wall, and there is substantial structural damage at the front building. NPS Form 10-900-a (8-86) OMB Approval No. 1024-0018 United States Department of the Interior