The first Catholic services in Baker City were held in October 1862 in a building that the church bought for that purpose.

[4] The diocesan chancery was added to the north side of the church covering the lower part of the apse in the 1960s.

The main facade is flanked by two towers of equal height that are capped with octagon-shaped spires and crosses.

The rectory, which also served as the bishop's house, is composed of volcanic tuff, and it is laid in the same manner as the cathedral.

The former chancery building is composed of volcanic tuff like the cathedral and the rectory, but it is randomly laid and it does not have the proportion of the other two.