The octagonal church, built on a stone foundation and with single-layer brick walls, has its ground floor at street level.[2] It is topped by a large, copper-skinned dome, from which it gets its common name;[3][4] the Javanese word mblenduk means dome. The dome is supported by 32 steel beams, 8 large and 24 small.[5] Two towers, square at the base and slowly rounding until topped with a small dome, are located on either side of the main entrance, while a cornice consisting of horizontal lines runs around the building; Roman-style porticoes covered in saddle-shaped roofs are located on its eastern, southern and western faces.[1] Blenduk also features etched and stained glass windows, as well as wood-panel double doors at the south-facing entrance.[1][2]
