The rear is even more curious, a rounded apse projecting out of the very flat brick façade which ends in two rounded corners. The forms make the rear seem Romanesque and fortress like and the round arched windows reinforce the Romanesque feel.
This architectural schizophrenia is caused (as it usually is) by two building efforts. The original building was built in 1763 with rounded arches of the prevailing Georgian style. You can see where the old west façade was by looking at the gable end of the roof.