Also known as the Union Athletic Grounds or Union Grounds. A diagram in the Boston Globe on April 3, 1884, around the start of construction, indicated the layout as follows: Huntington Avenue (to the north, some distance back from the main stands and home plate); Boston and Albany Railroad tracks (northeast - home plate and third base); Dartmouth Street (southeast - left and center fields); Boston and Providence Railroad tracks (south - center and right fields); Irvington Street (west, right field and third base - approximately corresponds to Yarmouth Street). The field was to be encircled by a bicycle track, as a number of ballparks were in those days, owing to the growing popularity of cycling. The property once used by the Boston Unions is now occupied by Copley Place.

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