Jefferson Avenue and Northampton (google map).
Storefront churches are common in the City's East Side neighborhoods. They're often located near more mainline houses of worship, a pattern that's repeated in many Rust Belt cities. Chilean photographer and sociologist Camilo Vergara's work How the Other Half Worships (2005) is helpful in understanding this phenomenon.
Photos from this series are cross-posted on fixBuffalo's facebook page and archived here - Photo of the Day.